Some background: have previous experience with 24' round above-ground pool, bought foreclosed home, and obtained my first in-ground pool.
The in-ground pool is 18' x 36' in size, 3' to 8' in depth, and step entrance. The filter pressure runs about 10 psi. If I remember correctly, the psi was about 40 psi on my previous above-ground pool. My in-ground did have a bottom drain but a previous owner had in removed. Now the pool has one skimmer.
My question is: what is your pool pump pressure and what is your pool size?