Here's the reality. Partical board is one of the dumbest things they ever came up with.
Get's wet once and it's trash. It turns to oat meal.
Even the rising moisture from under your home is going to cause it to swell up and change size.
All the partical board needs to go, once it's gone, install 3/4" T & G Advantec subflooring using coood making sure the seams do not line up nstrution adhesive on top of the floor joist.
Since your going whith linolium your going to also need a layer of 1/4 subfloor rated plywood over the subfloor, the seams can not line up with the seams below, no glue is used.
It needs to be fastened every 4" on the edges and 6 to 8" in the field.
Any flaws and seams need to be filled or there going to show through the flooring.
If you skip out on any of these steps or use the cheapest linolium you can find your just going to be going back and doing this all over again.