Thank about what pressure is in the intake track and how much compression pressure is on both valves when closed
As far as boost on the back side of the intake valves on the intake stroke where else is the pressure suppose to push on
The last thing is think about the crankshaft degrees(720 degrees for each complete 4 stroke power cycle) and how long the blower is building boost compared to how long each intake valve is open during each power cycle
I'm a firm believer in having more valve spring pressure than needed to keep the valve train stable than having a tiny, tiny bit too little