I don't think my EE bump stops are cut at all. When I installed them in 2004, I thought all of the parts were made by them except for the shocks(Edelbrock). So after learning they were just an OEM optional part, I'm not sure how they need to be modified for some vehicles. I lowered mine a about 3" early on with the kit etc, and later I played with the height again before getting an alignment. I didn't drive it much with it really low, I was just deciding on what height I liked best for me. My Mercury is a good bit lower than my Explorers, all of those won't take a good alignment with them lowered as much as my Mountaineer. I've bottomed out in the front occasionally, on hard dips or bumps. It's the back which my softer Mercury springs allow it to bottom out too much. Any dip or hard bump, with no load, makes mine hit.
So you need a good combination of spring rates as well as being lowered properly, camber kits etc.