Maybe it is in the oil I am using, r in the fact that all my engines were new when converted, but they all remained scaringly dry on top, and for me that never was a point of worry since ASP in their manual recommend that the owner lubricates the rockers manually every 2 hrs or so.
Since I don't like manual lubrication, I did the crankcase drain mod.

It works well, I see zero change in valve lash.