Ok, its almost a year since I started on this. This is how my last results look like:
http://imgur.com/a/kpBneThe best one is this one:

At higher pitches the chink is almost gone, at lower pitches ther still is a bit of a gap at the "top" (=back), but no second gap in the front. I still seem to open the chords in an "O" shape, which is not great, I guess, but hey - it improved tons.
Voice field also looks better:

In rehab sessions I can span over 3.5 octaves, which is pretty cool. Also the jitter is low ("vocal tremor") and the colored dots on the graph are almost forming a line for the colors, which is also a good sign - it says that the vocal break is less pronounced. So I declare my voice more or less healed from most of its very bad issues I had from speaking in a wrong way for years. Of course it still is low pitched. A really relaxed F0 is at 100-110 Hz, when speaking I seem to be between 130 Hz and open end to the top depending on intonation. Average is usually 140-160 if the high sylabils are calculated together with the low ones. So it still is very much noticeable that the voice is still a low voice, Even keeping it above the 130 Hz is a noticeable tension that I feel when I allow myself to relax in a lonely setting. And occasionally it goes down to the 120 Hz if I dont watich it.
So I talked to my voice therapist about all of this and she agreed with me that a surgery is an option for me, since I have a good resonance/sound to the voice that is mostly female, since I am able to compensate for some oddities, since I care a lot about my voice and am regularly doing voice rehab and because probably with a higher F0 I can then relax more and work on some other things easier. She will stick with me and guide me through voice rehab after a surgery and see how to make the best out of it then - no matter how good it will be or what drawbacks I experience. So that was giving me more confidence and now I sent in my present data and possible dates to Dr Kim at Yesons and am waiting for a reply - to see if he also thinks I improved enough, see if they got a date for me that fits and so on. To top it off, my dad was supporting me with some money so I dont have to spend my saved money for this on some bill that came in. I think chances are, that I will be in Korea in Spring . OMG...