Spring Break is pretty crowded in Port A. Of course, Pioneer is huge and MOST of the spots there are filled with snowbirds that don't leave until Easter. The town got hit very hard a couple of years ago by Hurricane Harvey. It's been about 2 years since the hurricane now.
We've been twice since the Hurricane. The first time was 7 months after and most things were closed or simply blown away. We went again last March, later in the month, and much had been rebuilt and even improved. Some things closed and never have reopened again.
If you know PA then you know Clines Landing - the big tall condo complex on the ship channel. It was damaged so much they have stripped it to the bare concrete structure and are totally rebuilding EVERY condo in the place. Last March it was just the shell showing.
As I said we went in late March last year and it was not too crowded. But it was after Spring Break. You are planning to be there during the official designated Spring Break week.
Sorry I'm no help on the fishing aspect. Not my thing. I mostly see folks on the pier next to the CC station.