Wingnut, I don't know if the beams are going to help or hurt your situation . Trikos is right anything that helps to bust up standing waves is a good thing . But I wonder where they are going to reflect the waves too . That we cannot say with any certaintity . At any rate I doubt that you are going to remove them so again it looks like it is something that you will just have to make the best of .
I for one feel that you could probably get a very true to real sound in this area if you wanted too .