You have failed to factor in the angle of approach - it DOES make the ball bigger because now, there are two angles that will result in the cueball hitting the correct contact point. Your goal here is not just to make contact but to pocket the ball and get shape.
Well, as I've said, I don't think shape is a big factor here. You have to get within a diamond of the 2 ball on the wrong side for shape to be a problem.
When kicking, your angle of approach is the greatest determinant for difficulty.
I'm not sure what this means, but I strongly disagree with it when your preferred angle of approach makes it necessary to juice up the cue ball.
Fact is, I kinda like your shot and might take it more often than not, but for me it's in the "fun but ill-advised" category. For those who actually think it's the better shot objectively, I suspect it's a combination of fun-but-ill-advised, overrating the shape factor, and misperceiving the "bigger ball" principle.
I could be wrong. I'm told that happened once in the 60s but I don't remember that decade.
pj
chgo