Nicely done Florent and like Richard I've recently started on this one as well. You've done a great job on the core as from what I'm seeing from the stacked data it's going to require a fair amount of controlling.
Steve did mention that there's more ha data to come, so you may just want to wait for that before making a print. It's going to look great I'm sure. With that additional ha data there should be enough to make a noticeable difference. I'm going to try combining the red and ha data in pixinsight to see what it looks like with what data we already have.