oServoSP1 vs oServoX on Hacked Servo's

Although most of the code I see working with hacked servo's seems to use the oServoX object I discovered the oServoSP1 object is designed specifically for hacked servos.

Used this object to calibrate the two Rogue Servo's .. pretty interesting results .. had to build a table with using a range of .center values to try and get them both to reverse at .value=0. Same .value don't result in same reverse speed .. but they do in forward ....

Need to try this with other hacked servo's to see if I get the same result.

Guess this is a process everyone goes through in using two servo's to for independent drive.