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[Biggie Smalls]

That is a great observation. Basically, it is about building muscle memory for a range of weights rather than a single weight.

Majority of the time I use my 2-11. I can use 2-10 well, and am able to go up to 2-13 (against quicks, I am little slow with a 2-13 Amplus, also Keeley made. ).

Yeah , building muscle memory for the range of weights -exactly .
When i watch video footage of my bowling machine sessions i now find i do all the little adjustments automatically.  Ie / i dont have to consciously think about raising my backlift a touch more for lighter bats or lowering it slightly for the heavier ones . Also , i like to have my hands slightly further apart on the handle for the heavier bats and now  make that adjustment without thinking about it.......i think my muscles are remembering!   

[SD]

Personally, I have always found adjusting the timing of my shots according to the pace of the wicket to be more of a challenge than adjustments dictated by the weight of the bat that i am using.