The Ha is great Chris, some great detail there - amazing to think what can be achieved in this age of imaging from inside a large bright city
...good times
Greg has given some good advice there, I like to make various blends of data with the Ha and then combine with the RGB and then re blend again and again until the stars match. I did it almost perfectly on the Hubble palette version but I too had some residual halos in my Tunnel of fire, not really objectionable but there none the less.
Mike