Eh, not really. I think it's wild the underhood sticker has that large of a range. the service manual calls for a spec of 20 on the intake, and 25 on the exhaust, with a range of .02mm in either direction. A valve clearance check, and adjustment if necessary, is done every 105k with the timing belt, so you should set them to spec and not worry about it "loosening or tightening over time"
Basically make it tight enough that the feeler gauge doesn't fall out, but loose enough that you don't have to really force it, if that makes sense. a set of stepped gauges is ideal