What happened was I was able to uproot his front leg but not enough to keep him unbalanced for long enough to get in the side thrust or pull him in for a punch.
Id get him on one leg but when I shot in further he was able to still keep his guard up and jab at me, effectively halting my advance.
When I get this technique to work its usually because i catch them putting their weight mostly on that leg and i trip them, or Im able to sort of spin them out of the way with the sweep allowing me to kick the ribs or punch the side of their head.
However I was unable to do either to Goju for the previously stated reasons.