That's been leaking for a while based on the stain below it. Definitely something I'd address before your trip home.
Based on the starboard selector being slightly askew, I wonder if the valve is leaking and not the line set, perhaps the prior owner found a position to minimize the leak? You...
There's a difference between the ratings of the OEM platform and the transom. With patience, Sea Ray and/or Marine Max will confirm the ratings for both...
If you want to test the theory on performance improvement send a buddy or two all the way forward when you go out next time. See if you notice a quicker plane/less drag. My money would be on "not super noticeable" but anything could happen. The most noticeable change for me was that the boat...
Have you checked in with other AC owners to see if your performance is typical of that model? I ask because our boats are within 1500lbs of each other, I'm running less horsepower, and mine performs like a champ even with 500lbs of dink hanging off the back. I wonder if maybe you have an odd...
Balance will also depend on all the other stuff on the boat (people, coolers, etc). You may find it difficult to keep her list-free, which is not entirely uncommon.
Did you check your manual to confirm that a 40A fuse is what's intended for the amp? I'd start there perhaps. You can get the electrical schematics from Searay.com.
Silly question...but how did ya give her a test ride if she's got no batteries??
It looks like your holders are sized for Group 27 batteries. Sounds appropriate.
https://s3.amazonaws.com/srweb-pvt-prod-us-east-1-294962523550/static/parts-manuals/1995__1995-290-SUNDANCER.pdf