There is not a lot of info on this object, and not really a lot of images either, so getting a feel for the field and image is difficult.
Probably the best way to add the Ha is to use the method Andy described in my post on the Dark Tower or try the NBRGB script in PI.
I toned down the Ha in my image as no matter what method I used, it came out orange or too red.
Looking good so far.