The windward mark is likely going to be a place where boats meet, so make sure that you have complete control of your boat when you reach it. If you’re on starboard, pinning out another boat, you need to be able to hold them there without ever making contact. In addition, your jib trim largely controls fore and aft movement of the boat relative to the leeward boat, so trim and ease according to their speed. You want to keep their bow roughly at the leeward shroud, while always keeping enough flow to get moving if they start to accelerate. Then, when your teammates have rounded successfully, you need to be able to get back up to speed with a huge roll tack.