The re-valve doesn't really have anything to do with your initial preload pressure but a heck of allot to do with how the shock preforms through the stroke. I'm guessing the pressure in your rear float will be close, if not the same as before. The real results are in how the front and rear skid shocks work, not in pressures. My sled, at the same pressures, feels so much smoother on compression and rebounds allot quicker. That is what i wanted, and why i got re-valved. I'd work from where you were before you sent your shocks in. Make your changes one at a time so you can see what is happening.
