When my flow was really fast, I'd express a bit first, to ease it up a bit before bub went on.

I generally only needed to do that for the first big feed of the day, unless I'd skipped one, and ease feeling really full.

I also found they were less refluxy if we fed in a more upright position, or a football hold, with the legs angled down (again to get a less horizontal line).

Good luck!