It took my daughter 30 dives to get comfortable and she wasn’t using a drysuit.
You’re also diving Dutch which can be limited viz and without visual reference points divers go up and down. I’ve even seen instructors with issues when they go to the Caribbean and realize how bad their bouyancy is and now everyone can see them :(
Once you get trim in Dutch you may do some other local dives in salt water and the process starts all over, shallow dives need more lead but how much? Every dive is a learning experience.