Not saying it'll be steady RRR, just comparing a vac leak to a intermittent or pressure return to the intake by a mal-adjusted valve.
The vids on the link demonstrate how to tell the difference .
Yes, wild cams will not be steady, but shouldn't be " irregular or choppy? "
Just saying check the simple stuff first, before pulling things apart.
He admits not being too familiar with valve adj. or if done correctly.
Cheers