1) I shave my tower a bit so I can use the original mounts without spacers, then I use a black .090 spacer on the bottom. Clears everything with room to spare. This is the route that b4.2 took with a running change to the shock tower part as well I believe.

2) The o-ring is a pita when new, especially with the .050 head screw. The 1/16" head screw works much better, but both have the same problem. When the o-ring is new, it isn't large enough to not easily slip by the screw head. You kinda have to just keep working the wrench back and fourth a bit until it stays under and you don't tighten it much at all -- just enough to where you see the o-ring squished decently and the screw isn't completely loose. When the o-ring swells due to shock oil exposure, it becomes far easier to work with. Having said that, many folks don't even run the o-ring now, or have switched to a losi brass washer. Personally, I run the o-rings and just deal with it being a little dumb at first... then they swell, and it's fine. Granted, it's one of the worst designed bleeder systems I've seen and it's release in that state is second only to the release of the rc8.2 with it's front upper arms that banana in 3 outdoor races.