Have you done any other mods to ensure oil reaches the valve stems through the rockers? For example,
connect the 2 oil grooves in the cam followers,
cut oli grooves in the rocker shaft so oil can reach the valve adjuster screws with higher pressure.
Cut oil grooves in the case behind the cam bearings to improve the connection of the oil galley's in the left side of the case with the right side.
Drill the oil galley for the cam followers in the right side of the case to connect it to the trust cam bearing oil galley. With this mod you create 2 oil connections from left to right.
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