Double rocker oiling- a problem?

Every part of the oil system deals with minute pulses - that's the nature of a gear-rotor pump. If you have a very good mechanical gage and solid copper lines you can see it in the gage's movement at idle. Yes, a small fraction of oil will leak out of the pushrod when the lash is not take up - but that's also when the lifter, pushrod, and rocker are "at rest". So the need for oil is less. Once you raise the rpm there's more than enough oil to lube those parts. Remember they are all designed to work with splash - not pressurized oil like a bearing surface. The factory oiling only occurs for 10-15° for each cam rotation - it really doesn't take much.