Yes 300s subs through a narrowband filter...what more can one say really. Very impressive. I'd like to see what it can do under dark skies with some basic RGB work. Not sure how you would top your Cent A image. Wouldn't need a three night effort. Probably after the first night with this set up you would be at a point of diminishing returns in depth. Of course I wouldn't be stuffing around to 300s luminance subs darn it. Go long and let those pixel wells bleed.
Don't let all that light capturing power go to your head Mike....oopps too late.