I have an information about the option 6 : It work only to the main character and Cassandra.
In fact even the number rest at 10 you couldn't active more skill that you have in reality. I have test. At level 1 (so with any point in reality), even the option is active i couldn't active any skill (even the number is 10). I use the option to have more experience. I earn 11 levels, so 11 more points to activate skills. I active the option so my number is not 11 but 10. I active skill normally with no problem. BUT when i use 11 points i couldn't active more skill, even my number are still in 10.
I have an other information : The option 6 work perfectly with the main character and Cassandra. I could active all skills without problem. I have this problem with Varric and Solas (and maybe the future character but i don't have it at the moment) .
I think that Caliber have work on the main character and Cassandra to make the trainer but not on the other player. So the option of the trainer don't work on them (FOR THIS SPECIFIC OPTION i precise). The others options of the trainer work perfectly.
Thank you to your great work.
Option 6 works perfect for me on every character.