I would advise not to use a go/no go scenario. You should find the exact gap and proceed from there. Stack the blades up as needed to get an exact gap. Hopefully, you are using a true metric feeler gauge?
Are you planning on doing the work yourself? Personally, I would not let that tight one sit, nor the really loose one. You might get lucky though in that you could swap those two. My first valve job, I was able to swap my only two out of spec shims and bring both to the middle of the tolerance range.
I always try to get the gap as close to the middle of the range as possible but looser is better.
I also highly recommend getting
Dinqua's Shim Calculator. An invaluable tool when figuring out what shims you need.
