Lap your waterblock to 1200 grit. Clean processor die. Apply tiny amt of AS3 (only enough to make it sparkle) on both proc and bloc. Mate. Get 5C-10C better. Dump Rio shite pump. Get a Danner 350 GPH online for $40 USD. Run it inline. Ooh and ah as it runs quiet. Push/pull with your fans at 7V. Watch your temps go down to 45C or below. Add Hyperlube or WW to your mix in 1 tbsp/Qt, watch your temps drop more.
I did the same thing. I recognized that my Via Aqua 1300 was a POS and canned it after 20 minutes of testing. My fans had to be bumped to 12V before I got decent temps, though (it made a 4C difference on my BIXr2).
If all else fails, drop your CPU in a bucket of chilled mineral oil. That'll do it for you.