Yo firlefranz. Only just noticed we are almost identical stats and looking for the same board. From what I've seen the Whatever is super flexy, I think the base is also a step down from the Goliath so it's supposedly not as fast. I ride mostly groomers too, with a tiny bit of park. I demoed a Goliath 156 a few weeks ago and I really, really liked it so I'm set on either the 157w or maybe the 160w, seemed pretty playful but not too flexy if that's worth anything. Haven't tried the ET. All I can say is that TBT was really good. Wiredsport will probably be able to offer a better insight into which length will be good, guessing he's off for the weekend though.