I have a 9'x18'x4' pool that I'm filling. For the 2nd time. The first time, it was wayyy off. My brother and I built a wood frame and leveled it. Filled it with dirt and using 2 2x4x12's screwed together, we leveled the dirt the best we could all the way across. It has about a foot of water in it now and the sides are bowing in like the last time. I measured the water in all 4 corners. One of the 9' sides is 12" in both corners. The other 9' side is 11" in both corners. Please dear God tell me that's not too much of a difference. Will the frame poles straighten up as the pool fills?