There are many new bows out there that would be leaps and bounds better than the one you where using. Make sure you buy a Lefty. Let the pro shop show you a bunch.

I understand you are new to this sport so I will offer some advise. I don't think hitting a 1/2 gallon milk jug at 30 yds is good enough to hunt at that range. You should be able to keep it inside a softball at 30 yds to attempt that shot at live game. Keep them short and close until you get some kills under your belt.

Good Luck.