When I had the EBC yellow pads in my were not the best(a bit doughy, needed 2 stabs to get instant response), but I think that may of had something to do with the install. EBC reds professionally installed work from start. I have not used the pads you have so can't comment on them.
Heat cycles are fairly standard and as per the manufacturers recomended bed in process. Gradual braking from 60-20, 8 times then let them cool a bit, then repeat say 4 times. Then from 100-40 and repeat. If you have acess to a private road higher speeds are also recomended. Firm but gradual without stopping seems to be the trick. I've never cracked a cheap RDA rotar doing multiple track days, sure they got a bit crazed, but they wore out before they developed into cracks.
With the R33 GTR brakes you won't lose much to the AP ones, sure the AP's are better but unless you have great tyres I don't think the on track differences should be that different in purely braking. Weight savings with the high end APs maybe?