In regards to steering, to take advantage of the boat as delivered, read the manual about the TDE (thrust directional enhancer) position of the throttles and the use of No Wake Mode. The TDE position is designed to increase steering authority at low speed by only partially opening the reverse bucket thereby directing some of the thrust down and to the sides. The No Wake Mode button will raise the engine idle in three steps to increase thrust and control authority, as well as increasing the speed in and around the dock or Marina. While I do not have the exact boat you do, I can say that with the throttle in TDE position and No Wake at level 3 steering control is brisk. Then like
@Acard7 says if you want better control then opt for one of the steering enhancers, it’s never going to steer like a car, nor will it steer like an outboard or I/O boat.
Your best friend here is practice, practice, practice. Go out some where away from boat traffic and practice low speed maneuvering, you’ve got twin engines so you can use differential throttle-one forward one reverse to enhance your close quarter maneuverability just remember to keep the steering wheel centered when splitting the throttles, you can literally spin the boat around without moving forward or backwards. I’ve found that if it’s too windy splitting the throttles doesn’t have enough control and you’ll have to use both together and use the steering wheel to maneuver. I’ve gotten to the point where I will use both tactics. Again practice is the key.
The No Wake button becomes the cruise assist button when you’re cruising. It will raise engine speed eight steps up and eight steps down from your throttle set point. This is a great way to dial in your speed when the water is rough and I would imagine a good way to slightly incrementally increase or decrease speed when surfing or towing.
I’d say the number addition is an onboard battery charger that will be plugged in while the boat is not in use to keep the batteries fully charged. The alternators on our boats are not that powerful so the battery charger is a must. A 10x2 NOCO would work out fine, and 10A is necessary for proper charging of lead acid batteries so you can get the most out of them on the water.
NOCO also makes a convenient AC port.
The GENPRO10X2 is a 2-bank 20-amp waterproof on-board battery charger for lead-acid and lithium batteries and rated at IP68.
no.co
A remote AC Port Plug with an integrated extension cord that requires zero cord modifications. Perfect for engine block heaters, chargers, and more.
no.co
The only other thing that I’d suggest would be installing a Victron Smart shunt on your house battery so you know what the state of charge is on your house battery how many amp hours you’ve used etc. These are configurable on any size or chemistry battery. They have a Bluetooth interface that works with Victrons free app. But it’s not necessary right away.
The SmartShunt is an all-in-one battery monitor, only without a display. Your phone acts as the display. The SmartShunt connects via Bluetooth to the...
www.victronenergy.com
I spent the first season not doing anything to my boat except enjoying it, doing the basic maintenance and figuring out what modifications I wanted to do my boat for how I wanted to use it.
I say spend your money on gas, food, ice and sunscreen and go put a lot of hours on your boat this first season. Then make necessary changes over winter. Oh, get a service manual, it’ll help you with the maintenance.