We keep our boat a little further north in Rock Creek off the Patapsco and the water is slightly less brackish than the West River, but not enough to make a difference. The growth is very high on the Chesapeake and I would suggest not only a biocide but an anti slime agent.
We used ablative Micro Extra up to a few years ago with good results getting two years off of 2 coats ( red and blue)...a few more on leading edges of keel
bow and rudder). We switched to Ultima 60 2 years ago and are on our third season with it. We do have a diver who goes down every couple of months from March- October and when we take her north like Worton Creek I will dive her with a snorkel and wipe of the slime which is minimal. ( no nettles that far north). We switched to the Ultima because it appears to slough off at a lower speed than the Micron. I recommend either for your needs
If you were going to use a hard paint I would go with fastbttms recommendation of the Trinidad, however if you pull your boat every year oit will have no effectiveness year to year where I beleive the ablative will
Seeing as though you race
similarly to me what the speed you will save is that there will be less growth on your bottom than the rock hard racing
paints. The diver maintainence is important too.