Unusually I am going to disagree with this one pretty strongly.
* I am always interested in the basic contradiction of GUE training: Don't use gear to solve problems is a basic mantra, and yet BP/W, which the whole system is built around is exactly that.
Actually that's missing the point of GUE - the quote should also be don't use gear to solve
skills problem. But people always focus on the gear for some reason - the gear mandate is all about team uniformity and having one setup that works in (almost) all environments to make the human interface automatic. I could rockup in Mexico tomorrow, meet up with a random GUE diver, and go diving with the same deco schedules, the same mnemonics, the same gear setup. I could borrow a complete set of gear and instantly know where everything is from the SMB to the knife to the wet-notes. And it would be the same if I rocked up in the UK to do a deep tech wreck dive.
But i'm not the best spokesperson for GUE and should really keep my mouth shut
It was also taught on GUE fundies that you have to learn to correct for equipment - don't expect your rig to always be perfectly balanced for you, you need to know how to change your body position (notably your head, arms an legs) to in effect act as levers to correct any balance problems inherent in the gear setup.
However, by getting the initial balance of the gear right, then the newer diver can for once work on just their body position, and understanding what "right" feels like. Once the diver knows that, they can then correct any balance issues with the rig by adjusting their body position in the water. When both the gear is unbalanced, AND the diver is new, then it makes it particularly hard. I reckon I could go out and dive in a jacket BC and get in horizontal trim, but until I was taught how to, i simply could not make it happen despite trying my hardest for many a dive.
When i finally had an instructor show me where my body should be, it felt totally foreign as what I
thought was horizontal was nowhere near so. That's why the OP should get someone to take photo's, or get someone with real experience to help them out. I too was trying too hard as you describe, but that's because no instructor (and I tried 3) could offer any decent advice on how to get properly stable in the water. Just "keep trying" when I had a dozen variables was just never going to make it happen. I was shifting weights around, and moving tanks and trying to play with my breathing and trying to move my legs etc etc etc but because I had no recognition of what balanced in the water column should feel like, it was just pot luck.
When my Fundies instructor sorted out my rig, adjusted the plate, moved weight around, forced my body into certain positions, then video taped it so I could see what he was on about, it finally clicked, but only after a couple of dives of continued monitoring and correction by him. Now it seems easy.
I think I'm rambling but what I am trying to say really is what I said above. A properly sorted rig makes it easier to learn. After you learn, the rig doesn't matter as much anymore.