Before every pump, use hot compress / hot shower. After pump, use cold compress to slow down refilling rate. To cut supply gradually, place cold compress for more than 5 minutes, or as long as possible.
Secondly, take lecithin to thin milk and avoid clogged ducts. Thirdly, stretch the time in between your pumps out. Can do gradually if you know your breasts will clog up fast.
Canice