Live OR Die:
First you say you are at 1.15v on your 3.2ghz overclock. Then you say you've "lowered" it to 1.3v and your "not sure how much lower you can go...".
First of all 67 degrees (celcius) max on an i7, especially overclocked, is not just "OK", its *good*. The i7 runs notoriously hot...