Here is a thread that discusses several of the modifications you can do. It goes quite a ways down the rabbit hole on how to maintain a consistent flame via regulating gas pressure.
I have not spent the $$$ on getting a gas regulator as I tend to do small batches (less than 200 pieces) and my flame does not change too much in that 10-15 minutes it takes to anneal.
Lastly consider upgrading your catch pan to one of these: