George,
I wouldn't worry about the FTX entry order right now because every time you run FTX Central v3 it will re-arrange all things ORBX into an alphabetical order. This is a know bug and ORBX support says it will issue a correction as soon as they figure out how to fix it.
Your FTX insertion point below OZx NA is correct and Central does not muck about with OZx entries (at least not yet!) after you manually moved Tongass X 2 entries below FTX and above OLC set the insertion point for the OLC to below Tongass Fjords Lower Priority and your good to go. (the OLC will stay put after that.
Basically Central has three faults at this time.
1. Alphabetizing the FTX entries which changes the order
2. Moving the 5 VECTOR entries (APT, CVX, EXX, FIXES APT and OBJ) above the FS 2010 Global Entries (if you have those)
3. It will re-write the library as above EVERY time you run Central v3.
If you are not buying any software from ORBX or there are no announcments of an update to ORBX scenery I would just not run Central any more than necessary.
(Screen shot of my insertion points)