I have used 30 weight VR-1 with Schneider Cams Formula 2 break in additive.
Comp sells a similar product.
All the cam manufacturers insist on using a break in oil supplement with their flat tappet cams.
But the supplement helps all the moving parts to get safely through the high friction of initial start up & wearing in.
Schneider also has an additive ,Formula 3, that they recommend using at every oil change.
Step Away From The KOOL AID !