Help me find the umph in my 360

Couple of points:
- a tq conv always has some slippage [ only a lock up con vert in LU mode has no slippage ]
- the slight surging you are feeling at slower cruise speeds is because of the cam duration/overlap
- the cam has 5* of advance ground into it. The LSA is 112*. If the cam is correctly ground & everything is machined accurately, then if you installed the cam on the '0' mark of your timing chain set, the ICL is 107. So it is already 5* advanced from the 'straight up' position & I would not advance it any more than an extra 4*.
- a muuuuuuuch better cam for your combo would be the Isky Mega 270. It will idle better [ has 15* less seat timing ] & perform better everywhere else. You can get the current lifters re-faced if they are ok & use them.