Any HONEST diver will tell you that bouyancy is an on going process, that is worked on EVERY dive. Even abter over 700 dives I am always working on my bouyancy. If you are weighted to light you will pop at the end of a dive, also if you are using aluminum tanks you will pop at the end of a dive if your to light. That is wy I use steel tanks when I’m diving in any kind of water. Hope this helps you.
Clay