The last few years I have been printing mostly square from shots with my Bronica and Perkeo. For that I cut 11x14 down to square and make test strips of the offcuts. But I don't print much, only a few of the best to enter in shows. On my last print session I was thinking maybe some sort of electronic assistance might be nice, but I seem to manage with my archaic methods. There is a certain intuition gained with experience as to spotting where to stick a small test piece to get the essentials.
I also print 5x5 test prints and winnow out a few of the marginal shots before hauling out the full sheets. At that small enlargement I use a 2-stop ND filter on the enlarger. Removing that to go to 10x10 or so makes the same timer setting remarkably close, at which point I use a small test strip on a critical area before the final print attempt.