I own a glock 30 and have never had a problem in over 9K of logged reloads thru it (plus a few K of factory ammo, mostly wolf). Accuracy wise, it shoots far better than any shooter that has shot it to date. From rest I can get 2" groups at 25 yards and one range officer shot a 3 shot, 2" group at 50 yards off hand, I've been able to hit Silhouette targets at 100 yards from time to time. (you just have to aim a little high)
I would question the "factory" ammo that is blowing up glock 21's at the police academy's. The academy in my area buys "factory" reloaded, lead ammunition that they shoot thru their glocks. Which, according to glock... is a big no no. They did get a blown glock 22 at one of their qualifications, but the officer was known for not cleaning his weapon.....ever... He actually couldn't remember how to take his carry gun apart... AND IT'S A GLOCK FOR CRYING OUT LOUD!!!!
Anyways, try a few out in your hand and see how they feel, and how the trigger feels. I loved the way the H&K's felt, but their triggers I didn;'t like, same for sigs. I also didn't like the grip angle of the H&K and Sig vs the glock).
I had the same problem with 1911's jamming and having to be "broken in" (hence me carrying a glock 30 for the last 4 years) until my most recent purchase. A S&W 1911PD 4 1/4". Out of the box, it's shot 500 rounds without malfunction or noticed loss of accuracy. No cleaning in between and 3 total range trips spread out over a week shooting Ball, HP and SWC ammo thru it. you might look into one of them as they are light and have great triggers.