My apologies in advance if there is already a thread but I couldn't find anything solving my problem. First off, my toon has TS level 110, adorning 514/575 and transmuting 550. The last recipe book I could scribe was Advanced Adorning Volume 11. But I can't use neither Transmuting Distillations nor Transmuting Dilutions Vol. 11 though both require adorning 500. Afaik in the past the distillations and dilutions recipes were always tied to the advanced recipes. Same volume that is. Also the recipe books for Planar Adornments, requirement is 505 so 514 should enable my toon to scribe the book, can't be scribed.. I think there is something I miss but I can't see what.
In order to scribe the books your base/natural skill has to be a natural 500 (for the example 505 skill required you mention). Meaning no items/buffs/mounts anything to boost you to over 500.
UPDATE: right now my toon hit 530 adorning and could scribe all 3 books. As far as I could see that toon has no tradeskill bonuses at all.
I looked you up and you have 20% bonus in your Far Seas TS tab (Support Specialist) and that was causing your issue.