Sounds like the oil metering part of the lifters is allowing a pretty generous amount of oil to pass thru.
Imo, the original top end oiling would have been adequate with the stock cup type pushrods and adjusters.

Now that you’ve converted the rockers as you have, I’d only want enough pushrod oiling to lube the pushrods and adjusters.
That could be a very small hole.

To put in it perspective……
When using the full time oiling on Indy heads, one .050 hole per side is plenty to oil everything.