Brian,
Don’t know what others will say, but I’m happy to tell you what works for me:
1) Both outer bearing collars pointed outboard – maintains axle (and handling) symmetry
2) Check out sharkshifters 4 o-ring exhaust outlet. Works really well
3) My j-arm is equally close. If all else is assembled correctly, no problem
4) Again, try shark’s mount. Fits well enough im not even familiar with the problem.
Best of luck,
Josh Martin