I have gained a ton on DitRs without spending a ton of time just focusing on catchers. When you're making your draft rankings, identify catchers that project to 57 or so or lower who would be major leaguers if their AA, PC, and big 5 hitting ratings were all projected 20 points higher, and put them at the very bottom of the players you bother to rank. When you trade with someone, scan their minor league catchers and see if they have a similar young guy, and ask for him as a throw-in.
The payoff is that at any one time about half my teams are running DitRs at catcher. Usually they're just the platoon partner vs. LHP and defensive replacement, but still, that's a nice yield for very little work. And sometimes you get a legitimate starter. T
his guy has a career OPS of .767 in a pitchers' park and has a PC of 91, and
this one has an OPS of .808 in a slight pitchers' park and has credible defensive ratings.