SF,
I also don't care what FC Maytronics recommends.. I'm sure it is there so that if push comes to shove they can use if for an excuse to say the problem is not theirs.. That said, I have yet to hear of a warranty claim that was turned down because of high FC...
I run my FC around 8 ppm or so and have a five year old dolphin that is still running fine..
High FC is just going to make any difference to the robot itself.
Thanks,
Jim R.