I'm not sure about where some manufactures base their spec #s , they don't print th correct info..or they base it off using the step, because the seat psi is light 15 lbs with a set I just checked. Comp cams.
Most inner coils have more room to collapse than the outer. I was always thought to cut the inner step to locate the innner spring . It's easier on the guide and less spring harmonics... But ultimately the goal is to obtain a particular seat and open pressure of said spring...so if it takes leaving the step to attain that advertised pressure... and you have plenty of clearance to...then leaving it could be an option...or getting a better spring that physically specs as advertised.
Typically you cut them to fit to locate the inner.