Kind of a pain. I made triangular furring strips out of 2x6 lumber of different thicknesses. The largest being 2" at the far end to a taper to nothing 4' long. I needed to support the bottom of the pool so hence the 4' length. Also, I wanted to ensure the coping, or the wire loom on the rim met the cedar boards right in the middle of the boards bit also fixing the 2" slope towards the non deck end of the pool. I also put rubber gym mat padding on the bottom of the pool on the inside between the metal bottom and liner. Stuff that is not straight drives me bat shit crazy.
So basically your typical unlevel shit. Trying to appeal to the eye as far as the surroundings and level the deck to the point where it doesn't look off compared to the surroundings. The patio was pitched on purpose to draw water away from the house, but the 2" pitch might be a little much. Anyhow I'm done and just have painting jobs for the rest of the season which doesn't require 400 tools as I mentioned in another post.