I think that having all of those effects, on all of the crew, is a bit much. Instead, I'd suggest that some of those effects occur, on some of the crew, depending on where the ship is hit. For example, if you take hits near the front of the ship, near the waterline, this is hardly going to effect the top deck gun crew at the rear of this ship. Similarly, it's not going to effect those handling the sails very much. The way I'd like to see it work is for the supression from hits only effect the local area, and simply just make the local crew a bit worse at doing their job. The surpression caused should scale with the damage taken. (I.e. A few 6pdrs won't do much, but a full broadside of 12pdrs will do a lot more to effect the crew.)