[Matt]

Im also somewhere between 10-2-B and 10-2-D. I've had a tac-tic for a little while now and find that it's very difficult to not have a Slight bend of the left wrist near the Top, if I go for 10-2-B that is not the case. I can't full swing with 10-2-B.

Does a degree of turn in the lead wrist grip lead to some wrist bend, the more turn the more bend?

Usually yes, which is why there is a contingency for a "geometrically" flat left wrist in the book.