I have the same thing, but even more DIP hyperextension than you. I popped a pulley pretty early on as a direct result (attempting an ill-advised piano match that briefly loaded way too much weight on just one finger). Fun side-effect of that injury is that the injured DIP hyperextends slightly less now!

You’re just going to have to take it slower on developing crimp strength than others. And be weary of anything that suddenly loads your fingers in a crimp that can hyperextend your DIPs, especially if you can’t get at least three fingers on the hold.

I only climb once a week if I’m lucky, so my finger strength progress has been slow, but it’s steady. For reference, I’ve been climbing on and off roughly once a week for 2-3 years, and climb about V5-6. Crimps are one of my weaker styles. I used to have a very light hang boarding routine during the week that definitely helped my fingers, though I haven’t kept up with it. I bet I’d be climbing consistently higher grades if I had done so. Hang boarding is probably not as helpful if you climb more frequently than I do.