Thanks Waz! Yes you could be right re the saddle heights on this bridge. Looking around I can't see much I like the look of as an alternative though. I think a standard fender one would not look right, even in black. If I did rout out I'd use my plunge router after cutting the edge with a sharp file. You are right, it only needs a couple mm lowering. I have seen a couple of rc4 kits that have needed the bridge lowering. Still thinking about this!
Not too worried about filing down the brass, I have a good bench grinder sander setup which should do the job. Interested if I think might give a nice bright sound.