It must have been a mfg snafu. Camshafts don't even take that much stress! A bit of torsion when the motor is accelerating, but they're mostly just along for the ride. I think Skunk2 stage2s have the best gains for an all motor application, and their off vtec lobes are near stock, so they will not affect emissions. I haven't heard too much about the crower vtec shafts, only the ls shafts. I would think someone like TODA or Jun would be a better comparison to the skunk2s.