I haven’t got my car in front of my but,
1) I’ve never had this problem, or even close I don’t think. Having said that the magic setup only ever uses the outside hole, which is quite far out. Looking at this picture
http://www.oople.com/rc/photos/reviewx5/rears.jpg you should be able to use the furest out, or next one in and have no problems, even with savers on.
2) I did have this (but on the rear), I preferred to let them wear into each other for the best fit if you know what I mean. I always ensure the first run on any car is at a non competitive event where you can have a proper ‘shake down’. Diffs, slipper, tranny settings, basic handling and setup etc can all be sorted in a handful of runs. Then the next time you use it it’s all sorted and you can have confidence to thrash it.
3)The tension is not as easy to adjust as say the xxx4, where you had the long arm of the tensioner to get accurate settings. Chris’ method is very good. In a pinch I have another method. Slacken both tensioner screws, and slide the tensioner to the max tension you can hold with just the force of the driver in the screw head, then do it up. This will be somewhere near.
To get this more accurate, you need to mark the exact position of one of the screws on the chassis, then take the tension off the belt (diff or slipper assy out), back one screw off and the other slightly so you can just move it fractions each time. Once you’ve found the belt tension after a few runs (belts do stretch a fraction), you can leave it like that for ages cos anything else you need to work on, doesn’t involve taking the tensioner out
HTH