I agree wholeheartedly about lapping both the True and the cpu ihs. REmember, there is a difference between lapping and polishing. GEt both surfaces as flat as possible, then polish if you want. Apply thermal paste sparingly. Insure that you have a good mount with even pressure on all corners. You might want to look into the "washer" mod- I did and it helps. At the settings below I run 38-40 idle with ambient in the mid 80's F, and in the 60c range while gaming. These are not exception, there are average for a properly prepared True.

I am not satisfied with 4300mhz- I want at least 4500 or more. This is definitely going to take liquid cooling.

Follow the suggestions given and you should have no problems at your clock speeds.