I've tried out a rocket launcher since it looks so good onthe Uziel, but couldn't find any practical use in quickplay. So then I just threw on more JJ's! Out of my Uziel loadouts, this is the one I've had the most success with. While lasers don't work super well with jumpsniping and this boy lacks any ECM, it can still work fairly well as a mid-long range fire support. The JJ work wonders on maps like Solaris, even with 1 fewer JJ There should be plenty of ammo to last you the match with the single GR, but it might no hurt trying to get a little bit of magazine capacity for the extended Polar Highlands matches, it's the only map that I've ever run dry on ammo. :V I love this lil guy, but his beautiful missile hardpoint is hard to work with and he's fragile.
RL vs 2JJ is really a personal preference. RL can be surprisingly useful in some cases with a 30 damage extra burst, but +2JJ as you noticed yourself will do more on Rubellite and Solaris City.