I also run a -4 oil feed with no restrictor and have been for 10 year with over 250 laps at VIR 3.2 mile track and over 400 1/4 mile passes where I do a lot of testing , for years and about 80-90 turbo kits I used the -4 oil feed and never any issues with the cams , I doubt seriously thats your issue
Only way your starving the cams is if you have issues with the oil passages to the head , from what I see from the cams you had trash go through the cam oil passages all the plugs have to come out of the head or stuff gets trapped and comes loose when you get oil flowing
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