You need to work out what value causes the servos to stop turning. It is likely to be somewhere close to write(90) or writeMicroseconds(1500) which are roughly the same thing. For that I usually use a potentiometer and the Knob example with a serial write() added to write the current value to the monitor.
Then you can put a write() with that value immediately BEFORE the attach(). That will override the default 90 value.