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I recently purchased a 2008 Montauk 190. It has some moderate rub rail damage I am going to repair.

I’m in the process of weighing the new to me boat minus the trailer to understand how much moisture I could possibly have if any.
Boat plus trailer was 4040lbs at transfer station scale ( if that was accurate) with no gear other than 2 batt, about 1/2 fuel, 115F mercury.
I will soon weigh trailer with and without the boat on it so I can see the delta for just the boat (1900#), eng(440), bat(120#), fuel ( 6.1#\gal) and remove most inaccuracies of the scale.

My top end speed seems to be lacking by about 10 mph, in similar conditions to the performance test data other thank painted bottom.
Boat sits at the previously painted bottom paint line. I don’t seem to find another 190 around to compare that to, as many have taken out for the season due to Hurricane that was predicted.

Q1. Am I right that if I remove any of the plastic through hull fittings or screws I will have access to the foam between the hull fiberglass and the gunnel or deck?
Q2. Would trapped water come flooding out, or just slowly seep?
Q3. When re attaching the new rub rail; if I use new holes that are off center to the existing ones, what material is on the inside of the hull glass beneath the top of the gunnel? Is that area solid fiberglass or is there wood?
Q4. How much speed loss on a bare vs painted hull with maybe two coats?

Specifically in my case I am thinking about replacing the centerline bilge drain and live well through hull fittings. If the water came in via the rub rail screw holes that got reamed out or the small crack at the seam between side of hull and top of gunnel about 6 inches in one area where run rail is also damaged, will it drain out down at the bilge drain at centerline if I take out the pvc through hull/live well intake, or does it get entrained in the foam close to the point of entry?

I know this topic is widely discussed, but have not been able to find the info regarding similar to what I am asking. If it exists somewhere on here please redirect me to that post.

Thanks in advance for any assistance.