coming into the top mark on port is fine, but you need to plan an exit stratergy if it all goes to hell.

even with 80 plus boats in a fleet there is usually room at the top to get a slot.

remember the rules, you can't tack inside 2 boatlengths if you will force a stb tack boat to sail above close hauled, this is rarely an issue in a big fleet as most boats on the stb layline are well over stood and do not need to sail above close hauled to make the mark.

you have plenty of room to find a gap between the boats going downhill as you pass the offset mark heading to the top mark.(its actually more dangerous in a Farr 40 fleet than a cat fleet)