I like using snooze and loose because when your enemy attacks you, you can counter attack with the godly jecht block.
Best. Signature. Eva.
Contrary to my Username/preferred character, I also like using Jecht, so I'll share my moveset at the moment:
Land BRV: (Should be rather obvious :x )
O - Jecht Rush
O> Jecht Block
O - Jecht Stream
Odown - Jecht Block
 - Jecht Beam
 > Ultimate Jecht Shot
Now, I know it sounds weird to have Ultimate Jecht Shot on any input besides neutral, but I find it easier for me to go into his HP combo if I have it in the last slot for some reason o.O
 Jecht Beam
^ Jecht Blade
down: Triumphant Grasp
As far as the other abilities go, I have Midair Evasion boost as well as Evasion Boost, along with all of the other usual ones.
I never mess with the Support ones, because the 3 that are default work for me
Snooze and Lose
EXP > HP
That's the gist of my build. The equips are Lufenian right now, but I plan on making them better. Hope I helped in some aspect >.>
riposte for jecht block
counter attack when using fully charged combo (just break through opponents attack)
sneak attack for assist chase
reflect boost against mages
and for support some times if i have cp remaining ex burst imput (im lazy)