I believe those jet vent pistons work faster in one direction than the other, because of the tapering in the holes only faces one side of the piston. Is that correct? I don't own them. Also since the oil moves through them faster than the stock pistons, you may need to use heavier oil. I've heard of people using up to 70 weight with the jet vent pistons. With the stock pistons and silver springs, 40 weight would be too heavy, but that's probably not the case with the jet vents.

When you drop the truck from waist level does the rear end bounce? And is the chassis slapping the ground?