need help with sabertooth

I have a trailer mover that has 2 x 500w 12v motors. It used runoff relays but that was very jerky and I thought I'd replace them with a Sabertooth 2x60 with a hc06 BT so I can control with smart phone. At the moment I am using "RC microprocessor mode"
I ran the example sketch, works nicely

// Sweep Sample
// Copyright (c) 2012 Dimension Engineering LLC
// See license.txt for license details.

#include <Servo.h>

Servo ST1, ST2; // We'll name the Sabertooth servo channel objects ST1 and ST2.
                // For how to configure the Sabertooth, see the DIP Switch Wizard for
                //   http://www.dimensionengineering.com/datasheets/SabertoothDIPWizard/start.htm
                // Be sure to select RC Microcontroller Mode for use with this sample.
                //
                // Connections to make:
                //   Arduino Pin 9  ->  Sabertooth S1
                //   Arduino Pin 10 ->  Sabertooth S2
                //   Arduino GND    ->  Sabertooth 0V
                //   Arduino VIN    ->  Sabertooth 5V (OPTIONAL, if you want the Sabertooth to power the Arduino)
                //
                // Sabertooth accepts servo pulses from 1000 us to 2000 us.
                // We need to specify the pulse widths in attach(). 0 degrees will be full reverse, 180 degrees will be
                // full forward. Sending a servo command of 90 will stop the motor. Whether the servo pulses control
                // the motors individually or control throttle and turning depends on your mixed mode setting.

// Notice these attach() calls. The second and third arguments are important.
// With a single argument, the range is 44 to 141 degrees, with 92 being stopped.
// With all three arguments, we can use 0 to 180 degrees, with 90 being stopped.
void setup()
{
  ST1.attach( 9, 1000, 2000);
  ST2.attach(10, 1000, 2000);
}

void loop()
{
  int power;
  
  // Ramp both servo channels from 0 to 180 (full reverse to full forward),
  // waiting 20 ms (1/50th of a second) per value.
  for (power = 0; power <= 180; power ++)
  {
    ST1.write(power);
    ST2.write(power);
    delay(20);
  }
  
  // Now go back the way we came.
  for (power = 180; power >= 0; power --)
  {
    ST1.write(power);
    ST2.write(power);
    delay(20);
  }
}

So I thought I might change it a bit so could get it turn clock wise or counter clockwise by substituting "power" with powerA and powerB. it didnt behave as expected.
My sketch below

/

/ Sweep Sample
// Copyright (c) 2012 Dimension Engineering LLC
// See license.txt for license details.

#include <Servo.h>

Servo ST1, ST2; // We'll name the Sabertooth servo channel objects ST1 and ST2.
                // For how to configure the Sabertooth, see the DIP Switch Wizard for
                //   http://www.dimensionengineering.com/datasheets/SabertoothDIPWizard/start.htm
                // Be sure to select RC Microcontroller Mode for use with this sample.
                //
                // Connections to make:
                //   Arduino Pin 9  ->  Sabertooth S1
                //   Arduino Pin 10 ->  Sabertooth S2
                //   Arduino GND    ->  Sabertooth 0V
                //   Arduino VIN    ->  Sabertooth 5V (OPTIONAL, if you want the Sabertooth to power the Arduino)
                //
                // Sabertooth accepts servo pulses from 1000 us to 2000 us.
                // We need to specify the pulse widths in attach(). 0 degrees will be full reverse, 180 degrees will be
                // full forward. Sending a servo command of 90 will stop the motor. Whether the servo pulses control
                // the motors individually or control throttle and turning depends on your mixed mode setting.

// Notice these attach() calls. The second and third arguments are important.
// With a single argument, the range is 44 to 141 degrees, with 92 being stopped.
// With all three arguments, we can use 0 to 180 degrees, with 90 being stopped.
void setup()
{
  ST1.attach( 9, 1000, 2000);
  ST2.attach(10, 1000, 2000);
}

void loop()
{
  int powerA;
  int powerB;
  
  // Ramp both servo channels from 0 to 180 (full reverse to full forward),
  // waiting 20 ms (1/50th of a second) per value.
  for (powerA = 0; powerA <= 180; powerA ++)
  for (powerB = 0; powerB <= 180; powerB ++)
  {
    ST1.write(powerA);
    ST2.write(powerB);
    delay(20);
  }
  
  // Now go back the way we came.
  for (powerA = 180; powerA >= 0; powerA --)
  for (powerB = 180; powerB >= 0; powerB --)
  {
    ST1.write(powerA);
    ST2.write(powerB);
    delay(20);
  }
 // now rotate Clock wise
  for (powerA = 180; powerA >= 0; powerA --)
  for (powerB = 0; powerB <= 180; powerB ++)
{
    ST1.write(powerA);
    ST2.write(powerB);
    delay(20);
  }
 // Now rotate counter clock wise 
  for (powerA = 0; powerA <= 180; powerA ++)
  for (powerB = 180; powerB >= 0; powerB --)
  {
    ST1.write(powerA);
    ST2.write(powerB);
    delay(20);
  }
}

any help would be great and I hope this is easy to read

it didnt behave as expected.

Bummer. Of course, you forgot to mention how "it" does behave, or how you expected it to behave.

Here, here. And, of course, a little formatting (CTRL-T) would make the nested loops more obvious and make it more obvious that the OP did more than what was claimed.