Re: Parts that should be replaced before installing the kit
If you have to use the tensioner because of clearance issues then replace the mounting nuts and bolts with grade 8 stuff. I bet the majority of tensioner/spoke collisions are due to the fact that with the stock hardware you can't tighten the bolts enough to secure the tensioner without stripping them. You should be able to kick it without it budging.
Of course if you can do without a tensioner that is the best setup. Second to that is upgraded tensioners that connect at both the seatstays and chainstays.