Thanks for the info!

The ridges and valleys are worse by one of the lights. It looks like they occured when they we're working on the light before they installed the liner. Seems like the builder would know to make it really smooth below the lights!

Also, as I posted earlier, our 20 x 34 Tahiti turned out to be a 16 x 32 "custom" and the only the thing the builder has said about it is that he had to reorder the liner because if he put in the original it would have wrinkles. I think that would be a really large wrinkle since the original liner would have been 680 sf and the custom they put in was 530.