Reducing oil to the camshaft?

You spoke of screens in the intake valley. I remember commenting on another thread, those are not to keep oil off the camshaft. They are to keep broken valve train components from falling any further into the engine. Oil will still go through screen.

I know lots of people restrict oil to the top end in order to increase oil to the main and rod bearings. I've never thought this was a good idea either. Just run an adequate oil pump and you will have plenty of oil.

To answer your question, yes, I have experience with it. I used to race almost every weekend from when I was a junior in high school until I was about 30. Got into the nine second bracket with our car. We never restricted oil anywhere. We did basic oiling mods like enlarging the pickup tube galley to the hemi size and running the hemi pickup as well as enlarging some of the other galleys, but we never restricted anything. never had any problem.

Like everything else, people do things different ways so you'll get lots of different answers.