My timing reduction at shift is due from my timing tables. If my car shifts from 6850 in 1st to 5200 in 2nd my commanded timing starts with what I have in that cal.air. I have all TM removed and i am getting NO timing pull during shifts EXCEPT for the differece I have in timing from 6850-5200rpms on the shift.
I have plenty of logs and the only drop in timing is on the line at launch and thats due to cal.air. For example, if i am stalling my car up to 1750rpms and while holding the pedal my cal.air reading is only say .24 well at .24cal.air my timing is at 33 degrees, well when i stab the gas pedal as the motor winds up its getting more cal.air and scrolling down the timing tables to say .68cal.air, well at cal.air of .68 my timing is setup different and is lower than at cal.air of .24.....Hope this makes sense, if not pm me anytime and i will try and explain better.