Controlling the valve mass is the spring's ONLY job, the lobes are effectively trying to "throw" the valve into space. The higher the velocity(& remember energy is a square law- 2x speed=4x energy) and the higher the spring load & the frequency tuning has to be. Velocity can be different to the extreme for the same lift so, no........less valve mass means one can use a more aggressive cam on the same springs, or use less spring load on the same cam, with a good beehive offering the best of the latter....