Details to convert pressed piston pin to full-floating?

I am aware of them. I have read of claims of bore wear with them.... but am not sure how bad it really is. (I suspect crud in the oil or from the chambers.) I am leaning back that way at this point....

I've been thinking that set screws will push the pin up to the top of the bushing but leave that tiny gap under the pin in the bushing. That could allow slight rocking of the pin on the set screw. That does not seem good...