Number one rule in disc golf: if there is a phone number on a disc, give them a courtesy call to see if they want their disc back. A lot of new players will keep discs, I know I did when I first started playing, but I always call now. Most of the time you'll meet up with the person to play a round. If they don't call back, it's yours.
Arroz is right, you have an understable disc if it is going right with a backhand right. Try to release the disc flatter (our even at a downward angle) and it will hug those left doglegs just right.
Or, get an overstable disc (Star Boss is my favorite stable driver) and you will not be able to to get it to fly left enough. Then get a heavy ass putter and you'll be on your way to filling out your bag.
A friend introduced me 7/8 years ago and I got hooked. Here's hoping for the same to you, buddy.
Champion Boss is my goto driver when I need distance. I can throw the hell out of it LHFH. Only problem is that you don't get to many opportunities to really chuck a disc.
I am throwing right handed backhand and the dog legs right come naturally. But when I try to correct for dogleg left I get this double Heizer thing going where the disc ultimately goes right in an S move
Well, consider yourself lucky; most people have to work to get that. Hell, I still suck at them most of the time. You must be using a really understable disc. Also, I imagine you're performing a sweeping motion with your arm instead of a "lawn mower pull" which is probably contributing to your arm being sore.