JeromeSolberg wrote:
Ross said earlier to this same question from me, "those clearance specs are good".

That being said, anything under can lead to lifter noise especially at hot idle, from what I understand, since as the valves and everything else gets hot and lengthens it does not have enough room to pump up. This was only from reports from others, though.

You've gone this far, why not "do it once do it right", as Kanter says. I tried the same basic thought as yourself when I measured some valves down close to .030", and subsequently have had problems with lifter noise at hot idle, with brand new valve guides and lifters.
I recently measured them all very carefully and took them down to the machine shop, the machinist shortened my valves while I waited, set them to between .040 and .050 clearance, eg halfway. I hope mine works, haven't had the time to finish the job, but at least my experience so far has been that valves at or below the low end of the clearance can be a source of trouble.

It's so much trouble to replace a head gasket and associated work to take off the tire and the fender cover and a valve, and my machinist spent so little time trimming the valves he did it for free. Why not do the best job you can right now?