I skied at 15 off at 30 for decades, because someone gave me that exact same advice. In my personal opinion it was the single biggest mistake of my skiing career. I ski shorter and faster because it is just more fun. I love the speed and I love the challenge. I am not fooling myself that I can ski that in the course, I just really enjoy it. I recommended the same to a close skiing friend who had been doingi the same 15 at 30 for almost as long, and he agreed - the faster and shorte mas just a lot more fun.

But it is something you need to work into. Get comfortable at the longer and slower and when you feel like it just try shorter and faster once in a while. When you can ski the shorter faster, similar to how you run 15 off - you will probably stay there.

As far as the bump - on a V drive I can't say. On my DD Mobius I never ski 22 off just because of that.
But on the DD at 28 off - no problem... But I think the speed makes a diff as well. I have not skied anything less than 34 in the lst couple years so don't recall.

Most important is to have fun.