This a great subject .
The original idea was to lighten the crank and silicone putty was a good way of filling the hole left from drilling.Manufacturers noticed a positive effect in shaping the silicone.
Silicone ramps do not directly increase power but there is a flow on affect .
They cut down turbulence buy changing the angle of the fuel and air flow into the crank the same as the turbo scoop in a crank does buy by changing the angle to the backplate .
The use of putty is not to save on tooling wear. shaping the crank in its original form rather than using silicone is pointless as the original objective was to lighten the crank in aid of quicker spooling .