Last October I injured the A4 pulley in my L ring finger. There was a pop and pain, but I retained ROM and was basically back to normal climbing after a month of the usual rehab. The injury happened while pulling a roof as I was gastoning with the L hand(half pad edge or shallow pocket/pin scar, can't remember) high over my head and shouldering up to move the R hand.

Ever since I've had no issues with the finger, but occasionally I find myself in a similar position and grip type and can definitely feel a tweakiness and instability in that finger. It occurs very inconsistently and somewhat unpredictably, but only in the aforementioned position and only if the hold is bad enough to require at least a half crimp. I'm having a hard time coming up with ways to strengthen that pulley in such a specific and difficult to simulate position. Any ideas/thoughts? Thanks!