RGB LED flickering

Does anyone have the correct way to set timer 1 and 2 to fast pwm, rather than timer 0 to phase correct?
I'm running 2 RGB strips, so I'm using all 6 PWM pins.
I've tried following other guides for this, but they all seem to assume you'd only want to set timer 1. My attempts to set timer 2 to anything else have it either not fix the problem, or it gets some massive deadspots for all values between about 50 to 225(I think its accidentally set to 16 bit mode). Timer 2 acts differently to timer 1, and I dont really know what I'm doing.
Setting timer 0 to phase correct PWN mode definitely solves my flicker problem, but I have a lot of code with some delicate delay interdependence, so I'd rather not have to adjust it all if I dont have to.