As an MvC2 player since the beginning of time my biggest habit that hurts me in Xrd is fuuuuucking chicken blocking. You can't naked chicken block in Xrd and I keep auto-upbacking when I feel unsafe.
Bad habits I have overall are:
-choking and simply going for a throw in a big whiff situation (whiff DP), which, in Xrd with meter and being an Axl player isn't soooo bad but I could be doing better things with the opportunity most of the time.
-Impatience. IRL I'd wager that I'm the most patient person I know. In fighting games though my aggression is through the roof. So naturally, I tend to suffer hard at neutral, which is in my opinion the most important part of fighting games. Lack of good neutral is what's kept me from being a "good" player in every single fighting game ever. You'd think I'd learn.
My tips on breaking/not developing bad habits?
-Use training mode to build muscle memory, this way when you're in a situation to do damage you react to it properly. DON'T run your practice on a static dummy. Fine, if you're trying out a combo but really good for developing a "I'm fighting a dummy" mentality in your subconscious. I suggest setting/recording the dummy to do -something- while you practice on it. This is because your opponent is not going to just stand there. Try to keep switching it up, that way you're learning but not getting complacent.
-Try to either fight stronger players often OR find a "rival". They both have their cons though; players that are much better than you can often be completely disheartening making it hard for some to grasp what's going on and playing often against a friend who's also growing as a player will build upon both of your skills but you can also grow too familiar with their playstyle leading you to autopilot more often than you should.
If I find myself playing against weaker opponents I prefer spending those low-risk matches trying all sorts of new things from combos to attack priority because it's not as dangerous to take a hit in these situations. Try not to use these matches to work on setups because you're playing against the inexperienced. Any player-based interaction in these matches shouldn't be committed to memory.