Welcome to TFP!

Are you still pondering that level issue? In most scenarios, we advise owners to cut-out or dig down the high side to make the pool level since "adding" to the low side generally isn't as stable. Obviously you can't cut through the high side. But 5-6 inches is a good bit of elevation to compensate for. Once you add all the water weight, whatever is added to the low side needs to be strong enough to support the water under the line and the supporting posts. Here at TFP, we recommend AGPs be leveled to within one inch to avoid uneven pressure to the walls and potential collapse. But post back with your progress, questions, or thoughts about how to achieve your goal. Hopefully others will reply as well. Good luck!