Pete, I submitted my reply last night but for some reason it's not here
I have spindles, I have the BRMs with tires as well. 135's and 205's like Pablo's oval. Forget the beam for now, but I do have a 4" coming in within the next 2 weeks. Slam it, get it running reliably, then worry about performance upgrades.
Unfortunately with the move I don't have time to help though. Sorry....