What IAT2 to start pulling timing? TVS with 2.8", 93 plus booster.

Yes the left values/ACT values can be changed in your tune as well as the right side values/advance.

There is some weird formula to figure the timing retard but since I don't have PRP anymore I can't look it up. I'm not sure my tuning software (binary editor) expresses the values the same way SCT does.

Binary Editor works the same.

Take the negative values from the function, and multiply by the spark retard timing table.

For actual values, I do not pull any timing on 93 octane up to 130F. From there, the ramp out rate depends on how aggressive the borderline or MBT (whichever is lower) spark table is set up - and also the power level.

I have run a 9.6@142 with a 2.7 upper and stock lower. Personally, I feel that pulley combo produces a power output that exceeds what the octane level and repeatability of pump 93 provides. I would probably use something lower than 130, use lower borderline/MBT values, pull out timing at a fair rate up to 150-160, and a much more aggressive rate beyond that.