Try moving the bands more towards the top of the tank. This will move the tanks lower on your back. I dive LP 85’s on just about every dive, and I never have a trim issue. Whether I’m wearing a 7mm or a drysuit. By repositioning the tanks low on your back, and the wing high on your shoulders, you shouldn’t ever need ankle weights. Just make sure you can still reach the valves for shut down drills.
That being said, hands on training with an experienced Tech diver is really what you need. It’s hard to teach on the internet.