I am currently trying to learn the inverse sonic 34-23, however I seem to have flexibility issues with my ringfinger. My ring- and middle finger can't move independently from one another, or at least when I curl my middle finger the ringfinger does the same thing. So when I try to do the inverse sonic from 34 I have to curl the middlefinger, but then I can't get my ringfinger to stay all the way back. I had similar problems with the twisted sonic 34-23, wich I kinda can do now but the inverse sonic seems completely impossible in the 34 finger slot. Any help would be much appreciated!