me and my dad go diving out of our boat a fair bit, prehaps you can come along once your qualified?
We have our own gear (masks, tanks, vests, fins, etc).
If I was you id go for a lighter weight with less air in your vest. For a start, you wont waste as much air inflating it, you will be more mobile as well as a large amount of weights can be quite uncomfortable. Also, inflating the vest reduces your ability to move around.
Also, how thick is your wetsuit? A thicker wetsuit will cause added bouncy. Personally, I wear a 7mm set of johns and a 5mm top, which adds quite alot of floatation to my setup, meaning I dont have to use a whole lot of air at all to maintain even bouancy (I cant spell that word )