i really think you've gotten some great advice. my take on this is that you can use it as an opportunity to reinforce positive behavior. spend some time together petting the kitty or maybe playing with it (i'll send y'all some catnip if you want, we have a bumper crop!) and then as his reward for being gentle, take him on a walk to explore the new neighborhood or a drive to discover the new ice cream store. that gives him a positive message, and also helps him start to feel in control of the newness of the move.
you're not doing anything wrong
it's just hard to be three sometimes.