capturing mobs can be increased by killing with a feral link (thats what the synch % is for btw, it doesnt affect the ability itself), and a fragment skill that increases the crystal droprate. 5 starring may affect but i doubt it.
green chocobo is better than flanitor imo. its a lot faster and has more HP to survive in times of need. However, Flanitor does have Hyper Rescue, which is the only instant heal Feral Link around. The rest that heal only heal for very little and predominantly give buffs..
to those worried about perfect game and getting adornments, you should probably know that the basic adornment you get depends on the number of live triggers you answer in the scenario, not the quality of them. However, there is a 2nd reward that comes from answering them with funny answers.
so New Bodhum for example.. answer 5 live triggers or more = Lebreau's Olive Tattoo. Answer 5, with at least 3 as funny answers = Golden Flower.
you can always do time reversal and get all of them. also after defeating the last boss, you can use the Paradox Scope fragment skill to give you a varying set of live trigger option choices. some of which are funny.
edit: which last boss? theres 4 battles in total
XI Wiki


And I had problems in general - there was just a ton of question I didn't know answers for and couldn't find them on the net when I finally started to search for them. Generally was an... interesting experience 
