Hi Dave,
I own an '90 18' cc. Also live in NJ and fish/cruise the Bar. bay. Tried for flounder twice so far at the Manoloking Bridge and got skunked both times. Thinking about going tomorrow! Got my fingers crossed! I haven't posted lately but have been reading the forums. As you stated there is a lot of useful information on this site, and a lot of friendly knowledgable members.
I share the same issue with the drains, but I also believe it would be a bad idea to close them. When I purchased the boat the previous owner had installed T-H Marine ball scuppers. They work ok but the previously posted check valve seem like a better set up. Not exactly sure how to install them, but I am definitely going to look into them.
I'm not sure what the original motor on my boat was but the previous owner changed it to a '97 150 hp Merc. Can't give you any cruise/WOT speeds, don't have any way to tell. Just ordered a new GPS so might have them soon. I currently have an aluminum prop(can't find any numbers on it. previous owner painted it and think the paint is hiding the numbers) but I am think of changing it over to SS.
I also was thinking about moving the batteries into the console to move the weight forward. I'm not exactly sure what that job entails but I think the gauge of the wire needs to increase depending on the distance from the motors. If you do it please let me know how it turns out.
Hope all members are doing well and wish you all a excellent/safe season.
..... me this morning. Can't believe how nice it is today!