I have a TT Moment "tunnel/cone" tent. It's design makes it VERY wind-worthy and it can handle a snow load better than most solo tents.
Although its perimeter floor and inner door venting nets make it totally unsuitable for winter (or dust storms. it still is an inherently strong and stable design. And with its optional light ripstop liner it can handle high condensation situations very well. I'm even considering extending the lining to cover the net inner door with a sanp-on panel.
I just wish this great design came in Cuben fabric. but then it would be a bit noisy in the wind, and very 'spensive.
As for "wet sag" of its silnylon I've painted the top 1/2 of the canopy with a 5:1 ratio of odorless mineral spirits to GE silicon caulk. Seems to keep it taughter when wet than before I did the coating. For sure some hard rains I've endured in the Moment resulted in no "mist-thru" so I think the light canopy coating did its job very well.
To further reduce sag I've found some light elasticized cord (about 3/16 " diameter) and made loops at each end tie-out. These cords are new so I only know it keeps the tent fairly taught all night in non-rainy conditions.