You mean it rolls out wavy gravy?
I have come to appreciate proper prep. If I take the time to compact after a couple inches and more importantly level things out and not settle for shoveling it in (needs to be raked level), I have more success. Same applies for road base.
I use a compaction plate a lot and have found that compacting clean DG levels out pretty good, but any amount of dirt will really mess up compaction.