For warmth: I'd suggest wearing a base layer top and a hybrid jacket (thin down vest with stretch sleeves). They're warm and stretch and they won't feel bulky. I see Crossfield and crew wearing them on videos in cold weather.
I've played the OL last year. My first year with them. I have the F9s 5 - SW. My distances are similar to yours. I dropped the 5i because I couldn't hit it that well. I went to the F9 5H std and 4H std. I play the set with 6i - SW and added a 58*.
@formula8 Do the standard length hybrids defeat the purpose? No, because most of the time I'm hit a 7 - PW approach unless I really screw up. On short Par 4s I could be hitting a GW and sometimes a SW. Being 5'11" tall I had to have an entirely separate swing for wedges because the clubs were so short I'd come over the top and pull - or simply just play to pull the shot: aim right of target and know the ball will end up about 10 yds left of where I was aiming. Extending the wedges altered the swing weight into the E level. That's why I went OL. I only have to change things with the 58*.
