Sure hope this solves the problem BC.
there is a top end oil restrictor offered by V Twin for the shovel head: its a special fitting that uses a # 100 jet to control the oil flow VT Part # 40-0050 I think it was around 40 $
when we tore my buddies chopper down because of the same condition you are having we found not guide gasket under the intake guide so along with installing new guides problem solved according to my buddy the old guides had only a few hundred miles on 'em but we wanted to cover all the bases. Who ever did the valve job for him last installed old valve keepers that were so rusty and pitted we couldn't believe they were used.
valve guide gaskets used from:
years used: 1936 - 47 HD part number 18265-37
1948 -85 HD part number 18196-51
Sharktooth you have done about 490 more valve jobs than me so you have the experience to do as you feel is correct.
I'm not one to test fate so I try my hardest to do things by the manual. theres no argument here.