warped rotors

[bigwave2255]

hi

i have replaced my front rotors due to warping with Zimmerman after market rotors, and they to have warped slightly in a very short time, so i had them skimmed, and they are now showing very slight signs of warping again.

(yes i know BMW doesn't recommend skimming however these still had more than the minimum thickness after skimming)

i have driven very conservatively since i had them skimmed.

this is starting to get frustrating, i know all the negatives for cross drilled and/or slotted rotors but i wonder if cross drilled would be an advantage in my case, i,m assuming the rotors are getting to hot driving constantly in stop start traffic

what do you think,

oh and i saw in a pic posted here of what looked like a break cooling duct but with a blanking plate over it!!!

what experiences have you had???

Ewen