Comp Cams stainless rocker question

I just got off the phone with my machinist,what he said was the banana groove isnt critical but is good insurance-he does the mod to all shafts if they arent grooved already.The important thing is to make sure the shafts have a oil groove (second groove) to oil the pusrod cup/adjuster-this is where a problem occurs when upping spring pressures it becomes a critical factor.The problem is if you look at mopar adjustment specs they allow for a very small margin of tolerence,this is due to the fact that if the oil hole in the rocker and the shaft dont coincide correctly the pushrod cup/adjuster dont recieve enough oil and can fail.The way to check this is to first make sue you have the secondary oil hole in the rocker shafts then with valvetrain set up make sure the hole coincides with the rocker-you could do this by sticking a piece of wire to see if it will pass through the oil hole in the rocker and into the shaft.This is the oil hole he drilled in the rocker shafts on my brothers car,it makes sense,if the oil hole isnt in the shafts or the rocker sits in a different position the pushrod cup/adjuster dont recieve a good supply of oil.Again he said this is required especially if you have spring psi at or exceeding 120lbs. seat psi.The crazy thing is most aftermarket rocker shafts dont even have a second oil hole and the rocker oil holes alot of times dont line up with fatory holes-definitely food for thought.