Do you have video of your rapid slash turns? Also are rapid slash turns the best way or the only way to ski bumps/ trees?
Take what I say with a grain of salt, I have not had formal training since I was probably 12, 30 now. I just learn form watching videos and others, I am pretty good at replicating what I see.
First: this would be the standard of skiing steeps, but I personally found that on a black or really a double black diamond that is straight blue ice the edges slip out from under you and you end up sliding down on your hip. So, if you take the first video and doing something like in this you can go almost straight down while keeping speed in check. The first video is perfect for place out west or in Switzerland, never had issues with ice in Zermatt, but at places like whiteface or Gore's slope "the Rumor" you can have literally no snow and just blue ice.