For your application 30 lb of lift is actually a great deal more than you need.
A wing needs to beable to floa your rig at the surface, and compensate for the loss of buoyancy due to wet suit compression.
A 1/2 mm wetsiut won't loose much, maybe a few lbs.
What's your rig weigh? Just add up the parts. Tank + Plate + Regs + misc.
Assuming an AL80, full ~-5 lbs + 2 lbs for the Plate + 2 lbs for the Regs + 3-4 for Lights, etc you need only about 12-13 lbs to float your rig.
That's why 18-20 lbs wings are made.
You might want to consider a SS plate, given that you carry 8 lbs now. You might be able to get away from a weight belt. Keep in mind that your current BC maybe inherently buoyant by 3-5 lbs, a BP&W won't be.
Regards,
Tobin
Opps, I failed to read the last few posts. Congrats on the new gear, enjoy!