sounds like you're not getting enough spin on it, try snapping a towel using your forehand motion, should help.You could also try the peace grip. but I don't think grip is as important as getting the proper spin.
my best advice is to your middle finger pad against the edge of the disc and you forefinger against the bottom of the flight plate. On your attempt to throw it keep your wrist cocked back the whole way through your back swing so when you follow throw pointing int the direction you want to throw it your hand will create maximum flick on the disc helping to keep it from wobbling.
go bearfoot on one leg and that should fix your wobble! ha. seriously, I am a 98% flick (forehand) person, if the disc coems out wobbly, you are not spinning (snapping) the disc right. it does take practice and certain discs need different amounst of snap. You will get it!
The wobble you describe is sometimes called "Flutter" or OAT (off axis torque). Flutter robs your disc of speed and stability, so the more flutter you have the more your disc turns over and the more distance you lose.
I have heard people describe flutter as a problem with the amount of spin versus the amount of arm speed. I'm not sure I agree with this, maybe because when I throw I never worry about how much spin or how much arm speed I have on a shot. I just throw shots harder or softer.
I think flutter has to do with the angle of release. If you release it flat and smooth it has less flutter. If you are experiencing lots of flutter then the flaw is that you are not flat and smooth enough.
One place to start is to focus on the palm of your throwing hand. I realize you don't use the palm to make a shot but the position of the palm tells you about the angle of your wrist. When you hold a disc to throw forehand your palm points upward. As you swing your arm to throw your palm points upward. As you release (for a flat, straight throw) your palm should still point upward. In your follow through you wrist rolls over and your palm ends up pointing down.
At the instant of release what your palm is doing is what matters. If it remains flat then your throw comes out flat and smooth. If it is in the process of turning over you get flutter. So hold that flat line for an instant longer.
I think there is a disconnect in human perception. We anticipate the "hit" (the instant of release) and guess wrong when it occurs by an instant too soon. This is also the reason why a follow through matters on a shot. Logically anything that happens after the release cannot affect the flight of the disc. But all the good players use a follow through. Why do they bother? Why not just stop at the hit? Because if you stop at moment you think the hit occurs, you stop an instant too soon and ruin the shot.
There is a practice component to throwing flat and smooth. A forehand throw is an unnatural motion, which is why beginners seldom throw flat and smooth. It takes trial and error to master this skill. Maybe a lot of trial and error, depending on the player. So don't focus on how far the disc goes or how hard you are throwing it, focus on how flat and smooth you are throwing it. Once you figure out flat and smooth adding more torque is easy.
Mark is correct IMO. Forehand snap is nowhere near the same as backhand snap. I think the majority of a good FH shot comes from being smooth with the throw and as he said, the angle of release. Of course you have to get decent snap, but with FH you are pushing the disc more then snapping it, I cannot bomb a FH over 400 feet but I can throw it on a rope 350, and throw mids and putters FH if I need to.
Don't think so much about doing this or that with a FH shot. Pick a spot and focus on the spot during your throw and just rip it.
FH takes a lot of practice but is the best investment you can make for your DG game, I always enjoying watching somone struggle on a shot BH then walking up and parking it FH. I then say,to my friends, "IF YOU ONLY HAD A FLICK!" in a funny jingle. Good times.
Try and find a local guy who is decent at FH and watch him when you play with him or ask him to help you. Good luck, FH rocks and saves strokes period.
PLAYING THE ATLANTA OPEN THIS WEEKEND!!! WISH ME LUCK!!!
Learn to snap a towel forehand.
It will transfer into your game automatically when you get good at snapping the towel.
Learn to snap low, level, and high for the three different shots, downhill, flat and straight, and sky pilot stall shot.
I can snap a fly off the wall both forehand and backhand.
More field practice will smooth it out also...
Try to make it so that you can release it slow and roll it on your finger along the rim. When you can do that and your disc has minimal wobble coming out of your hand and rolling around your finger try to throw it again.