For the sag question , what i said in my last post is what you are asking
"For sag , you should have about 55-65mm free sag on the forks for off-road , and about 45-55mm for MX (about 2.1 in. - 2.5 in. for off-road) , which shows your spring is too soft as you have way too much free sag ,
although keep in mind if your rear sag is off or your linkage is binding , it will haver a effect on fork sag , so make sure you have the rear squared away before worrying about the forks , remember .... balance .... front to rear is what makes a bike ride good"
What that means is the rear sag , by binding or the wrong spring rate or anything else that transfers the weight to the front of the bike when it normally would be balanced or less force on the front , will not only affect sag in the front , but the ride itself , handling , and how the adjustments in the front work and/or affect the ride/handling of the bike overall
The most important thing is to get the rear working as it should "first" then worry about what the front is doing , if the rear is off by either adjustments , or spring rate , or a combination of both , that will affect what goes on in the front of the bike , so fix any issues remaining in the rear , "then" move to the front , you can't fix the front first , its the whole package that needs to work not just one or the other , but you start with the rear , which is why so many focus on getting the sag set correctly (in the rear), it affects everything else
As for the Pressure spring goes , softer will give a softer initial part of the stroke where harshness is mostly felt with square edge bumps/holes , etc
The Pressure spring works together with the main spring in overall rate , but it works like a progressive spring , so the pressure spring works to help determine when the valving reacts , but , it also allows you to run a stiff enough main spring to keep the forks up in the stroke while offering a softer initial part of the stroke so the initial hits are less harsh
If you can find a rate softer than the current rate by about the same margin i am at with my setup as a example , you will be happier IF the initial part of the stroke is whats bothering you ..again , the main spring rates both front and rear need to be addressed and ridden first before worrying about the Pressure spring , it is a fine tuning tool not a sole solution to your issues , the other factors have to be working properly FIRST , you need to spend time (after springs are sorted out) with the clickers and if they don't give you the results you want , then i would go with the pressure spring , but even then , only after re-valving as well , as those things will give the most benefit , then use the spring as a fine tuning tool if you still have harshness issues
Ray gave some good advice , re-read what he said on the first page .. he knows what he is talking about ..and he doesn't ramble like i do ...