It really doesn't matter if the springs are single, double or tripple - if the pressure closed and open is not enough stuff breaks.
The Kent and Piper singles and double springs for the cvh are terribly weak.
7000+ rpm with the heavy rocker arms and valves etc.. is a disaster waiting to happen.

The recommended (by Kent) spring pressure of 70 lbs closed on a cvh is a joke.
Well over 100 lbs closed is needed for high revs and high boost levels.
Sure the cam and lifters will wear faster, but we aren't talking about a 30,000+ km lifespan engine here anyhow.

I had emailed David Baker (cvh guru) some time ago, and his valvesprings are far stiffer than
Kent, Piper, or Newman recommend.
The low spring pressures recommended are to (try to) ensure a long camshaft life.
Baker recommended 115 to 120 lbs closed pressure.

As far as camshaft and lifter wear - please remove that silly oil resrictor on the head.
I have no idea why most shops leave those in.