Can't offer much in the way of answering your first question since only trial and error with moving things around will solve that. I've not had any issues (touch wood) with my Spektrum DSM2 with Futaba S9451 but I always also run a power cap as I used to have issues with the servo glitching under full load in my previous 4WD.
However as follows
2) Yes - turn the EPA down so that the servo doesn't 'over throw' the linkage. If you don't it can cause undue loading on the servo motor and, with the strength of today's servos, could place undue stress on the steering linkage.
3) Trim the under tray slightly - set the car up to achieve full locak as above and if it catches under any movement of the suspension travel, trim the tray.
4) I do run my rear belt quick loose. I found that the kit instructions (mine's one of the original LiPo cars), the belt setting was too tight for my liking. Set it up as loose as possible but no clicking under acceleration. Also, running Diffs in the low position makes the car easier to drive over the bumps.
Front belt will be tighter cos of the additional roller to clear the lipo pack. Again, run as loose as possible but it will appear tighter than the rear belt.
Lastly - the belts will appear tighter that the ProCat - especially the centre one since the pulley diameters are smaller. This doesn't appear to be a problem in use though.
HTH
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