Not seeing much response from anyone on here, so I went to google and looked up this problem. You are not alone for sure. I know my son who is a mechanic has said to use a strong impact gun with 6 point impact sockets.
If that doesn't work, try going to google and look at the many responses on this. One even used the socket, breaker bar, pipe and a floor jack to really put pressure on the nuts. Worked for him. Sorry Andrew that I am not more help. Larry