It's hard to give advice here, because it seems like you're doing all that you can. I suggest you continue to stay a little mysterious, do GAL stuff, some more 180s...keep him on his toes. Most of all, I think your H really needs to own his part in the relationship problems. It doesn't seem that he has fully done that yet. Maybe MC will help him in that regard. I really think MC would help you both to communicate better.
Everyone says that when you start piecing, that's when the real work begins. It's obviously true! Just remember that patience is needed, as is lots of faith. You can do this, just think positive and don't let him get you down. Show him the amazing person you are and he'll have no choice but shape up.
As for the tattoo issue, I don't think I could cope with that reminder. I think it should be a priority for him to cover that immediately. It's a matter of principle, in my opinion. You have to set some clear goals and boundaries. Have you guys sat down and talked about the goals for your M? Or is he just expecting things to stay as they are? If things don't change between you -- and not just YOU but BOTH OF YOU have to change -- then you're going to be back in this boat in a year or two. I made the mistake of taking my H back 5 years ago and not working on anything with him. I let him just slide back into the old routine and look where it got me! Don't let that happen to you!