My guess is that the springs get stiffer with the cold and the door is less well balanced under those conditions. A higher power unit might help. I have no experience with that opener nor that size door. I do have a shop door 20 x 14 uninsulated and a 1/2 hp commercial door operator handles it fine. Operator made by a now-defunct company.

I'd be inclined to lean towards low luster--because its a garage door. I'm sure satin would probably be fine as well. But since it's a metal garage door, it really ought not be a focal point. I'd use a Direct to Metal (DTM) paint rather than paint for siding. Oil based. Add Penetrol so it levels out nice. There are water based DTM paint on the market as well. I hear they are good, so they say.

I wouldn't paint the garage doors white. It's too much contrast IMO and brings focus to your doors. With the current colors the garage doors aren't in your face, they recede. What is that dark door to the right in the photo? Your front door or another garage door? If it's a front door, that is where you want to bring the color so the focus is on your front door and not the garage doors. if you want to dress up your garage doors, consider going with a wood garage door.

chicagoans...thank you so much! And those pictures are great! I just realized the first picture I uploaded doesn't show the tape marks for the lights on the prow...oi :) The whole reason I posted....but, we have planned two up/down sconce type lights, about half way up, on the narrow vertical logs just to the left/right of the 3 vertical prow logs...so they'll shine up to the prow soffit (that we labored over staining/sealing for days..ha. We also plan for one above the garage door. Labor of love.) And LED sounds like the way to go cause they'll be up so high. Sure hope they last as long as they say they do :) The question I've been pondering is should we do the 'up/down', or just the 'up' lights? Im overly sensitive about not wanting to light it up too much out there..we'll have coach lights on the outsides of the middle two sliding doors on either end of the prow..matching the height of the garage door coach lights (on both sides of the garage door), at least that's the plan for now....wish I could put the sconces on a dimmer, but they're going to be on a timer, so the electrician said a dimmer wouldn't work unless we do a smart switch type thing-and we're all about not going the smart route--lol. Dumb lights, dumb switches...we embrace the dumb & thats how we roll...after my husbands flip phone finally died, not too long ago, he walked into the store and asked for the dumbest smart phone they had, lol. The poor young man who was trying to upsell him on the highest of high tech phones, didn't know what to say.