I measured them at 175.9cm so they come up about 1cm short. I'm 5'9 ish too (174cm) and I skied the 177.
Just for reference, I would probably go 177 again, though I would probably go for the Plus version all other things being equal. I did find myself wanting a little extra stability at times, and I'm 10-15lbs lighter than you. I'd rather go for a stiffer ski than size up, personal preference... which I guess is why they made the plus versions at all. I still really enjoyed the regular Wet though, even if they felt a bit short on occasion, I'd love to try the plus one day. The Wets are one of my favorite skis I've tried regardless.
Perhaps not my most useful comment on here ever because you could go longer, or stiffer or with the regular 177, depending on what you want from the ski. What size/what skis do you usually ride?
**This post was edited on Mar 2nd 2021 at 2:03:36pm