Sugarbush used to groom FIS much more often. The past several years they rarely ever groom it. 2 or 3 years ago I think the only time they groomed it was right before the final weekend of the season! This year I can't recall seeing it on the grooming list once yet.
Stein's mid-season sees the groomer every couple weeks or so it seems. In the spring it can be a lot of fun if it warms up enough. Sometimes it takes that trail a while to soften up. Back to your original list, Ripcord is groomed pretty regularly most of the time (usually at least twice a week). In the spring they sometimes leave it alone more and let it bump up. Organgrinder they do usually let bump up a bit (years ago it seemed this practice was reversed where OG would see the groomer often and Ripcord would be left alone more).
. There are some trails that can be great if not groomed: top gun (amazing 2-3weeks ago, flattened since), shockwave. Oh, one of my faves for lapping end of day hero bumps - 3D to Absolutely. 
