Yea I threw out all my old ratty wetsuits including a 2mm long sleeve full because we just bought a house off Mayport and they got purged before the move. So all I have right now is a 1.5 mill top and a brand new Xcel 3/2 that I'm trying not to put on until I absolutely have to for the reason you mention. I surfed the second walkout down from the poles and the crowd cleared around 10:30 or so. It was mostly my hands and feet getting cold. Just gotta acclimate a little since it seemingly went from 76ish to barely 70 real quick but I think it was mostly that the wind was whipping pretty hard by then.You don't strike me as much of a sitter, but I could see getting chilly during lulls. I went to Mayport in the morning and the Pier in the afternoon. I surfed far enough down the beach at Mayport I was alone; it looked biizzzzzy up towards the Poles. Pier had enough waves coming through to keep fed.
I think this movement kept me good in the shortsleeve top. For me, 68 water with air in the lower 50s. You put on a spring suit, you'll be cold-soft if we have an actual February. You sport the heavy top, the instant your ballsack touches water....