Yes sanding the tread might seem strange, though the results hardly any less predictable than the threepenny bit scrubbing effects that partial lock ups or over/understeers would give as these things do their worse.
I had a not dissimilar episode last year, year before i experimented to test my own freely admitted distrust of many mainly far eastern makes.
I bought a set of far eastern (respected make) tyres for my MB that were about as quiet and comfy as i could find, low and behold they were indeed silent and for the first 6 months of use (i run winters in season) were fine(ish) and i seemed to have been wrong all these years.
Then the weather changed around Septemeber time and one damp morning i encountered, just like our OP, two unprovoked full on tail out oversteers on the way to work in the early hours...not the sort of roads where lorry fuel spillage would be a factor, and i look for and can spot the tell tale colouration on a damp road where Diesel has been spilled.
That night i ordered a set of Uniroyals and the test set were removed and sold on, my prejudices confirmed, within a couple of hundred miles the Unis proved themselves unshakeable.
Tyres and brakes are to me the most important parts of a vehicle, and both must be as good as i can make them, call it an OCD if you like.
I too think the OP should leave them as is for a few hundred miles and see if they improve, i dislike plough on understeer intently a nasty effect that is difficult to do anything about when it happens, thats part of the reason i dislike and avoid FWD, so i wouldn't want them on the front, but the OP know his own car and obviously knows how to control it or he'd have wrapped it up already with these tyres, so his alone choice...lets be honest some people haven't got a clue whats happening down at the road and wouldn't be posting here asking.
Edited by gordonbennet on 27/01/2015 at 09:31
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