Have any of you noticed this? I typically use my RT to commute to and from work (30 miles) and when stopped at a stop light can someimes feel the rear of the bike sort of squat down and then come back up. I ride alone and have aonly a few items packed away for work, so bike is not overloaded. I usually have shock set at the middle range. But I have increased the shock value to a bit more firm and this occurs less. I have never had shock setting less than 50%. Anyone else experience anything like this?