Standard RB for ACR is 27%. There are some nice deposit bonuses if you google for them.
You should be aware that CardsChat offers many incentives for signups through their links.
You could inquire here to see if the CC-sponsored ACR option is still effective (if so, I would highly recommend that);
I'm not sure if HEM works for ACR but my feeling is that you should be able to import your HH without issue.
Here is a thread where you can ask: