Im not sure if I should know this or not, but, it seems like I dont have the answer and I can’t find it either so...... does a manual chain tensioner affect reverse? Seems like it could.
Like Vern said do the yami setup with the rollers. I've done them on a handful of sleds last year and they've all been problem free. And two of them are on short tracks and they use reverse a lot. Pm me if you go that route I have part numbers and a some extras of the parts needed to do it.