Because of back issues I have been skiing at 30 mph the last few years on a Radar Katana. I have skied into 35 off on that ski and run tons of 22 and 28 offs on it. I have also recently run some 32 mph passes on it as my back feels a little better. I weight about 205 and ski on the 67”.
I think the Union would work great. The Katana frankly turns great, is easy to ski on and is a lot of fun. I have to imagine that the Union would be even better.
Skiing is about having fun. It doesn’t matter what is under your feet if it performs well and you have fun on it.