If you plan on using gel coat be very careful using epoxy they don't work well together. I might suggest looking into the vinyl ester resins. If you going to paint with Awlgrip or similar epoxy will be fine.
My transom is 3 3/4" coosa on my 23. Seems like a bit of overkill but I'm not concerned about bracket coming off!
Try and figure our center line (forward/aft) of your boat and start doing a weight and balance to find out how weight forward and aft will affect the way your boat sits in the water. For example we calculated on my boat that moving the fuel tank a foot or so forward really helped on keeping the boat at an attitude that looked original. However as I burn gas this advantage goes away. That why I have a cooler of beer in front of console too. Oh wait that goes away almost as fast as the fuel! My brother and I put a lot of thought into where to put scuppers I believe you want 1.5-2.5 inches above the water line when boat is full. Again figuring out where you can put weight forward really helps out.
Good Luck!
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