I do IG liners for a living, but have a bit of experience with AG liners.
I think you'd do best to bowl the floor, as you surmiseYou also might want to lessen the cove at the bottom of the liner.
As long as you redrop the liner on a warm, sunny day, it will be able to stretch into the lower pool - without those wrinkles.
Let me know if you need more assistance on this, I'm here almost every day.
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