£65 puls postage??
no really mate i can see your point about spending your hard cash on RC items and there is nothing worse then them braking down on the last corner
but from your last DIFF post you did kinda rub ppl up the wrong way, and it turned out to be your fault,
i can see your point with the wheel nuts as ive had the same problem, i changed the wheel nuts for new and it was sorted,
how old are your wheels? if they have been munched where the wheel nut sits then it may not be making a nice contact?
is 1 of your drive shafts bent? this could make the nut loose with the vibration?
im just putting my thoughts to you and try and rule out some things