Yeah thats pretty conservative timing, could try a bit more and see if the power keeps going up. Once the torque stops increasing, or drops off then back it off slightly.
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You will always have the difference in chamber temps. The rear always seems to run a bit hotter. It seems regardless of the setup and changes people try, the difference is always there. My only theory is the water cools the front first and can't cool the rear as effectively, heat is more retained in the rear hense the temp differences.
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