almost 12000 miles and it's time for tires especially rear....do I stick to kendas or go another route...looking at kumho ast 225/50/15 with either solus kh16 or solus ta31 185/65/14 up front or do I go with Michelin defenders 215/60/15 rear and 185/65/14 fronts tire rack doesn't recommend either and says it will not warrenty said products something to do with the sidewalls