Well, if the cam bearings are normal so that the oiling interrupter function of the oiling-through-the-cam is working, then then next significant oil restriction and pressure reducer to the rocker shaft is the hole in the bottom of the rocker shaft at the #2 pedestal on the driver's side and #4 pedestal on the passenger side (where the oil feeds up from the heads). That hole should be .375" inside diameter and that, along with the 5/16" rocker bolt passing through that hole, is the main restriction into the rocker. If those holes are right, then you either have something wrong with that washer or the bolt is bent or the cam bearing is fully grooved.
If you can't ID something definite, then I'd prime the engine again and rotate the crank, and see if oil flows to that side in less than 60 degrees of crank rotation angle out of 720 degrees of crank rotation, or 2 full crank rotations. If so, then the cam bearings are normal ones.
BTW.... do you have an oil pressure gauge hooked up? Any monkeying around with the oil pump's pressure relief spring? Relief spring hold-in plug installed right? I'm just looking for any reason that your overall oil pressure could be abnormally high.