Looked up your thread from last year, are you sure your tt chip is for 21-24lbs of boost? Ive never seen one like that, the ones I've had have all said 23-25lbs for alcohol. Dropping under 23 went very rich. Last summer I was in your shoes trying to get a similiar combo working. What started working for me was lowering the gain on alky a little, leaving on the most boost that didnt spin, and getting a wideband. I was able to pull 1.7-1.8 60s with leaving at 4lbs of boost on Nittos. Wideband showed me what I thought were "safe" adjustments were actually still pig rich. When you get the chance post up the numbers from your timeslip.