FredC wrote on Dec 16^th, 2019 at 10:56pm:

. . . Parashooter's trick will make the "B" cam higher. I do not know an easy way to make the "A" cam higher. . .

First off, let's get away from the "A" and "B" business before we confuse the recruits. Those letters are in my picture (shown at bottom here) only to provide a ready reference for someone looking at that individual image and text. In general usage, those two elements of the trigger are called "front hump" and "rear hump" (except Lee-Enfields, where it's kind of vertical and we have upper and lower humps :-?).

Please note that the "trick" is needed only if one wishes to avoid altering an original trigger. If that's not a problem, we reduce the second stage by stoning the rear hump where it contacts the receiver at the end of the first stage take-up or reduce the first stage (and lengthen the 2d stage) by stoning some height off the front hump. (Stone both too much and go find a new trigger! :'()

Here's an image of the US M1903 trigger - different layout, same two-hump principle:

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