I'm not a zealot. 18 pound wings are the wrong choice in lots of situations (including anywhere you'll be wearing 5mm or more of neoprene), but they are made for and work fine for the OP's expected dives.You 18 pound zealots should pull your heads in when you know nothing past your own
inexperience, and don't give rubbish advice to a guy that has no idea what a wing does
I don't have anywhere near your total experience, but I do have a couple of hundred dives in conditions similar to what the OP has using 17 and 18lb wings. How about you?
As to what a wing does? It allows you to achieve neutral buoyancy under water as you deplete your gas and as your suit compresses with depth.
What it isn't is a substitute for a lift bag or dumping excess weight on the surface in an emergency.