I'm 180 as well & followed Tadpole(Russel)'s lead on 1375C (115/155).
The spec on them says they're 1/4" shorter than the 120/170, but mine were more like 3/8" shorter.
I can't issue the rave review that Tadpole did, but can say they don't spank as hard in the rough stuff.
Haven't tried 'em 2 up.
