I also have some brass that is shorter than spec (I've gotten better at uniform trimming now). When checking brass length after resizing, I end up with 3 piles: 1) need trimming, 2) "too short", 3) perfect length (my definition of perfect is 1.35-1.36"). The need trimming is trimmed to perfect length. I use the too short for plinking loads. While admittedly my plinking bullets aren't as good as my hunting bullets, I've not seen any adverse effects of using too short of brass...my plinking loads aren't flying all over missing the targets, my perfect brass fired in the same chambers looks fine, my throat erosion gage shows no wear that would alarm me, brass isn't sticking in the chambers.
So, while I wouldn't use the short brass for accuracy testing or hunting, I'd certainly use it for practice, plinking, function testing. Note: I've not done chronograph testing with short vs perfect length brass, and that might be a good test to do.