The NPC quest tracks are screwy...often you need to have two quests done. Think some can get blocked because another quest not related to your NPC is still open (NPC dialogue is locked on something else until you finish the other quest). Double check to make sure all prereq's are done., and you don't have any open quests with the NPC's involved. Tactics Pearl and NPC upgrade levels open up around each of the limit breaks as well. You may be getting messages for other stuff in the way, double check those tracks.
To get to 55 cap (so you can ding 51), need at least 35 bond ( I think I'm reading that right) and finished A Pose by Any Other Name. Past Reflections also comes up here...forget if that needs to be done too or not, if it's logged it could be holding you up. Picture Perfect require that you have the signal pearl on you--not in satchel or sack--to log it and then you can unlock 55 cap so you can ding 51.
60 cap has some screwy stuff ggoing on too. Monberaux is involved with various quests--something could hang it up there. If Luto isn't cooperating, it could be a snag from Blighted gloom, Chameleon capers, Blessed Radiance tracks. Again, need to have Signal Pearl on you to log the quest.
Note that to unlock 65 cap, you start it with the Taru and not Luto. Luto may chatter about other stuff before she finally talks about going to Sandy. Again, make sure her ramblings aren't dealing with other quests still open (ie: Blighted gloom, Chameleon capers, Blessed Radiance tracks). Again, need to have Signal Pearl on you to log the quest.
Edit: link to NPC guide on wiki:
http://wiki.ffxiclopedia.org/wiki/Ad...g_Fellow_Guide
