As always, really appreciate the input Dogmatix.
I'll make sure to ask about the "Genioglossus advancement" image you linked.
I think my chin may end up looking quite sharp and pointy, as its quite narrow.
Glad where I can contribute
I think it may be a good idea for you to investigate your current OSA status and take x-rays to see what it actually looks like. You had a rather significant advancement and it sounds strange that you don't experience more difference. Can it be that it is something else giving you these problems? Just so you don't throw yourself into surgery.
I have seen before and after cbct x-rays of patient who've had MMA for OSA, and it can look dramatically different in context of airways volume after such advancement. It would be interesting to know if you also have this dramatic change in your x-rays. If you're serious about doing another surgery, your surgeon will probably take another cbct. Ask him to sit down with you and compare your preop cbct airways with your post-op cbct airways so you get a good understanding of what has been achieved, and what the additional benefit can be.
Also, I think genioplasty in general will pull to open the airways, and not only the special designed ones I posted above. I think the biggest difference is that they twist the segment, which pulls the genioglossus more forward to specifically open the airways more.