It should have never seen lower than 2000 rpm.jmo
You would have to crank it till the cam was dry for that to necessarily be the case.
proper rotation of the lifters, 120- 130'ish psi spring pressure for break in and some zinc are the main ingredients for successful break in.
and the only reason for varying the rpm between 2200-3000rpmis to better distribute oil splash to all the lobes and excite the lifter spin along with the tapered lobe
BTW I bought a cam from hughes one time, the solid brother of the one you just killed
...It also went flat.
Engle used to make their cams untill they wanted profiles so fast they had a failure rate of %50, so they cut ties over warranty disputes.
I run engle now.