I'm not sure what sort of input you're looking for. It looks to me like you should have ample room between you and the m60s, and between the two of them. I'm not sure what effect the sloped ceiling will have, but I don't imagine it would be too detrimental. Personally I would keep them and not go through the hassle of exchanging them. Are you going to be in this room for many years to come?

[black]-"The further we go and older we grow, the more we know, the less we show."[/black]