Rich,
When applying enlish or draw or follow the smaller radius of a dime makes contact further from the centerline of the cue ball than a larger nickel radius when using the same "shaft centerline" offset.
Examples:
A 15mm shaft/cueball centerline offset with a dime makes contact 11.43m mm from the centerline of the cue ball.
A 15mm shaft/cueball centerline offset with a nickel radius makes contact 10.53 mm from the centerline of the cue ball.
So in this example the dime radius tip contacts the ball almost a millimeter further out than the nickel.
Less english = less squirt, less curve, less adjustment regardless of the shaft type.
None of this matters if you hit the cue ball in the exact center every time.
Cocoa