Bob,
I agree with you!
The tables really were on a true full fingertip, however they were created wtih the midpoint of middle bone of fingers.
And as you stated where moving a thumb /14 froward from where it is can tighten up a very relaxed span, so also reverseing the fingers has the opposite effect of releasing the now tightened up span.
A move such as yours should lead to less hit in the fingers and a narrowing of the gap between thumb and finger release, thus maybe slightly less revs and hit with the fingers and also a hopefully smoother transition off the harsher wet drys of todays bowling.
So is the theory!
REEgards,
Luckylefty