Im beginning to agree with chimaira, i think you may have one motor spinning much faster, your counterclockwise motor may be newer and faster, the clockwise may be more worn and slower, also due to the fact its clockwise to start with, they sell a reverse rotation motor for $18 bucks. You could be running 3,000 rpms, or so, different. Heres what i did..............i think i may have mentioned this to you in the other thread, its not real scientific, but i took my motors out and ran them off of a 12v lead acid battery, and "listened" to the tone/speed of each and they were very different one way, then i hooked them up opposite and they were dead on the same, so i went with them that way. I wont hurt to check it out, all you have to do is take out the four screws and pull them out, you've come so far it wont hurt to try it.