Re: Have a question about two-handed backhand?
As far as I'm concerned it should be the left arm. Try to practice more with the two-handed backhand with the left arm as the dominant one, maybe care more about the weight transmission between the left and right leg in order to gain a little bit of more pace (if you didn't do it before, of course). There are some videos on Youtube done by coachews that are interesting, just type in Youtube "two-handed backhand" adding maybe the words "grip" or "wrist" if you don't find a properly video.
Love for the game above any particular player.
Kenny de Schepper fact of the month (April 2015): Kenny de Schepper has won more Challenger titles than Federer, Nadal, Djokovic and Murray (Big Four).