slow cranking starter

That looks like a fancy 1.9Kw Denso mini starter. Should kick even a big block over with ease. I had a stock Denso off a RAM and it kicked over a 451 2x as fast as an old Mopar gear reduction starter. Looking at the specs for a direct drive starter from 1965 states it has a 78A@3800 (no load) RPM...with a ratio of 45:1 at the flywheel, thats only 84 RPM! The gear reduction starter was 3:1 to the flywheel so what would that make the starting RPM, like 29?