Slip

[Seacrets]

Willie, what are bumpers and ropes? j/k
Make certain your 150 tilts completely out of the water. If not, paint the lower unit with outdrive anti fouling paint. Do not use boat bottom paint. Prep the unit by sanding, then zinc chromate primer, then paint. Don't paint any zincs.
Dual battery switch
Dark blue or black seems to be he best colors for bottom paint in my area of Florida. It just seems to last longer than lighter colors. Why, I don't know. I've had very good luck with Trinidad SR paint. Make sure your guy sands or etches the hull and primes (2 coats) and bottom paints (2 coats).
Maybe a cockpit cover from windshield to the transom. Mine kept the cockpit clean and
no rain water to deal with.
I enjoy slip storage and I've also enjoyed rack storage. Of course, the closest I've ever come to a divorce was at the boat ramp. I have a tendency to start shouting orders. At times, it's been pretty ugly.
Constantly check all hose clamps and hoses on your thru hulls. Double clamp if you can.
Good luck and enjoy.