Serial.print(myPulsetime = (mypulseTime + pulseIncrement));
Why make the code more obscure than it needs to be ?
Why not more obviously
myPulsetime = myPulsetime + pulseIncrement;
Serial.print(myPulsetime);
Similarly
myPulsetime = myPulsetime + pulseIncrement;
m1.writeMicroseconds(myPulsetime);