the more "flat tappet cam" you add the greater the parasitic load to drive the valve train. what's less friction; a skid or a wheel?

some years back i put together a solid roller bracket engine with 750lbs open spring pressure. at about the same time i put together a mild hydraulic flat tappet engine with less than 300lbs open spring pressure. the break over torque for both engines completely assembled was the same 75lbsft. what i'm getting at is adding more lobe and spring on a flat tappet may never equal a "wheel".