As to the proper amount of pressure to have on the albums in the rack, you can compress them if you have to because the label and outer edge are raised and will keep the grooves from getting hit. On the other side, loosely packed, as long as the records are nearly vertical they should be fine and not develop warps from being stacked in a slanted position. Unless there is enough pressure or it is hot enough, the records won't change shape easily. I guess the left coast needs to be careful with the heat this summer but a bit of a tilt and having room to get records in and out easily should be the way to go for convenience and no damage.