I also have this condition. Here are a few things I have learned over the years that seem to work for me after much trial and error, hope they help someone:
1.Starting with my feet (I also have a few previous fractures to bones in my feet and ankles so the pain is beyond horrible if I don't take proper care) I wear snow boots with warm loose wool socks (not your ski socks) for the ride up on the ski bus, I have two pair of ski socks in my pack. When I get to the lodge I will carefully place powder on my feet to keep them dry and place the first of my ski socks (warm from the lodge and the ride up) on my feet, right into my boots (which I had a chemical warmer pack in for the ride up so they are toasty :). I reuse the loose wool socks on my ride down but not for skiing. The backup pair of ski socks is for around lunchtime or later, if its not too cold. I eat on the lift so a quick bathroom break allows me to swap socks again for a dry pair and I'm off. I also make sure that I don't over-buckle my boots. It isn't necessary and isn't good advice for us circulation challenged peeps. It can seriously cut down circulation and put pressure on previous fractures for sure. Tight enough to feel and move and nail it (they have some great advice here on this site so definitely check it out), in fact in the morning I rarely fasten them all up anyway.
2. Hands, muy importante' The chemical warmer I had in my boots on the way up (I use the foot warmer ones so they are rounded not square) get stuck with the adhesive to the back of my glove liners while inside the lodge, then the gloves go one before I leave it. First this helps with the circulation part, but also helps with the neurological signal to the area that causes the constriction. By keeping the nerves on the back of my hand warm it seems to help my fingers think they are warmer, also it isn't in the front of my hand impeding my pole grip. The chem pads are easily swapped out on the lift and warm up fast. I also have a second liner and set of fingered gloves in my pack as well. This is important especially if you tend to test yourself and know you will be eating some delicious Alta or Solitude powder. As a big reserve on days I know will be super, super cold (like my hair freezing in the uphill direction cold) I bring with me a mitten and a mitten liner. My fingers are then all held together and not separated like in fingered gloves with the little warmer fixed to the back of my mitten liner it can get me through a few hours at least.
3. Know when to fold them. I love skiing, I know all of us do or we wouldn't be on this site, but seriously, Raynauld's caused the constriction of your blood vessels. Its akin to putting a rubber band around your finger and getting the circulation back is painful. If it gets bad, STOP!. If they are blue or worse go to the nearest equipped restroom and run them under really warm water until they get it back. if you need a minute take it. Dry your Gaiter under the hand dryer with your hands in it afterward and let them oxygenate (and then your gaiter is toasty warm too). Its always best to think safely as you can't think well when you're in pain. Perfect time to hit the snack stand or the hot coco. Live to ski another day with all fingers and toes intact.
This is my first post but I was hoping something I say would help someone, keep skiing and stay safe this season!