counting shuffle machines

Im intrested in counting shuffle machines,where TC is -2...+2
For basic variation(example 12 stand against 2,16 stand against 10,not double 10 against 9,8 double against 6.
They all need +1 or -1 TC
Which is real penetr shuffle machines 1 deck or 2 deck?
How large TC we can get from CSM?

My main goal is not to get edge from BJ,but to cut casino edge minimum.
6 Decks, S17, DA2, DAS, ENHC, Early surrender
How much i cut casino edge by using tiny variation.
0.1% or .2% or not at all?