Hey, you're making some good progress down there Craigan!
Some motors "pee" stronger when in the water, but it could also be that the water pump propeller needs to be replaced. I don't know when the previous owner changed it out last, so you may want to check to see if it's worn out or not. Seeing as how you live close to the water, I'd first start her at the launch and see if it's stronger in that situation.
As for RPM's, I can't recall what they should be for idle, but that is also something that should be set in the water and in gear, which can also be done at the launch site with the boat remaining on the trailer.
Keep up the good work buddy!