03 cr 250 idle runs away

When the bike is cold no problems, after a few fast laps when the bike gets hot idle tends to "ramp up" and with the throttle chopped (totally closed) it will sound like you have it at 1/4 throttle.Almost like a bike sounds just before running out of gas.In 1st it will even chug you up hills back to the pits with the throttle closed. Also the carb likes to pee too soon when leaning the bike over. Here are the stats and things Ive tried,
float set per manual at 15mm from bottom of float to split seam between bowl and carb with carb held 3/4 upsidedown and float vlv making contact but not depressing the "tit" (tmx 38) None of the high idle happens until the bike is good and hot.Bike runs clean no smoke. Have any of you experienced this??
Bike has no motor-mods, ign is not advanced. here are the stats:

vp-U2
Idle adjustment-no help
air screw 1 1/2 out-turned in 1/2 turn no help-
throttle cable adjustment is good
Larger Pilot(slow jet)from 30-32.5 no help.
430 main
2nd clip
checked reed cage boot for leaks. Thanks for any info...

idle trouble

Thanks for the tips, Ill check out that seal. (actually I have just replaced the throttle cable last week but the bike did this before the cable change) I did try the JD jetting kit last week, but couldnt find a setting better than stock set up, and it still runs away. I have a full gasket kit Ill give that seal a shot. Thanks!