What I would suggest is reducing the number of times you pump every day, but maybe make each pumping time a little longer at least at first to accommodate. Dropping pumping sessions generally will reduce your supply.
How old is your baby? I found that the engorgement was worst in the first couple of months or so, but now that she's closer to six months, even though I'm pumping greater volumes less frequently, now I don't get engorged so much and I don't leak or anything at all... but when she was a month or two old, I was getting engorged more and leaking more, even though I was pumping more frequently and less volume each time! *shrugs* it doesn't make sense to me!!