Do you mean hanging at the far end of the boom, or midlength.I would get some type of indicator. It can be a piece of cassette tape hanging on the lower boom. You can use the search on the forum to see some ones users have made. When you can see the wind it is easier to adjust the sail correctly and to sail 45 degrees off the wind going upwind. You can tape cassette tape to your sail to see the flow and Google for how the telltales should look.
The bay is a great place to sail.
bluejester0b to get you can put a indicator a few sailclips from where you sit on the lower boom. I would guess you are sailing with a wood centerboard. If you get so you like sailing you can switch to a foilboard which does not sideslip very much. How old is your boat?
I have the "shadow board" which I think is what it should have for a late 70s fiberglass fish right?Check that you have the correct length of daggerboard:
https://sailingforums.com/threads/early-50s-sailfish-restore.41513/post-186720