One can actually feel up and down movement of the pushrods with your fingers if the tappet clearance is too great. That's where mine were at after the first 300 miles.
After my initial break-in miles, I adjusted with the engine cold to the point where I could still rotate the pushrods with some ease but there was no pushrod up and down movement at all. They are still at this point with 2300 miles.
I get some mild valve train clatter but it is like solid lifters on car V-8's philosophy - better have them a wee bit loose (within parameters) with some clatter, then to burn up valves that aren't fully seating.
And with RPM ranges not exceeding 5000 RPM there are no valve train harmonics issues.
I ride with earplugs plus a full coverage helmet - I can't hear the valves at cruising speeds anyway. The earplugs are to save what hearing I have left. It can sneak up on you and is not very nice. Around too much engine noise and gunfire in my life. Add in 60's rock concerts...
Regards, Foggy