You need to match the base sprak tables close to the main tables. That will give you a smoother transition from one to the other.

About the fuel trims ... if you are getting -12 at idle, I would start with subtracting 10 from it in those cells, JUST the idle cells.

 

thats the problem right there, the 1-2 should have some negative values at the lower calculated tq readings. If you dont have a shift kit and all the TM has been removed on a stock tranny this is a recipe for disaster the internal parts wont hold up.
the lower the number the less pressure the higher the number the more pressure, 0 is not a null value each tranny will be different

These are also the tables I use for modifying the 1-2 with a shift kit leave the base table stock and manipulate shift pressures with these tables. dont raise the force motor current table if anything it can go down. Aftermarket stall raise the tcc locking table. I think thats about all I use to adjust line pressure and shifting habits, dont have HPT in front of me.