I think you ought to ask yourself why you leave so many more negs than most buyers? In fact, for the last year you've stopped leaving anything else.
Many are for sellers with thousands of feedbacks, 99%+ positive. Are you perhaps being a bit trigger happy, and not giving sellers a chance to sort out problems?
Do try to get your number of negs down. At this rate, you may find sellers will take one look at your feedback record and cancel your bids.
