I used to be a member at Squantum YC in Quincy Bay. Moorings were available with membership and they had a launch that could shuttle you in and out if you didn't have a dinghy. I'd recommend you check them out. Not sure what the wait list situation is there now; when I joined about 6-7 years ago I don't think it was too bad. I don't remember what they allowed for dinghy storage.
Also I'd recommend you join Mass Bay Sailors (MassBaySailors : MassBaySailors
) if you haven't already. The list members there will have plenty of suggestions.