Does the commercial crabber have a name on his boat? If he does, what is it? I had this problem once myself, there are many solutions- some that may not be the best, but will work. Follow these steps and you should come out on top.
1. Ask nicely if he could please keep the traps a fair distance away. If this does not work move on to the next step.
2. Ask again nicely.
3. One more time- Three strikes and he is out.
4. Monitor when he pulls his pots. We will have what I call a circle party around his pots. We will get as many of us that we can and form a huge circle around his pots by anchoring up and tieing up to each other-if he wants to make it difficult for you- we will do the same for him- Kinda like an eye for an eye.