Unleash Tachi: Goten 100x times on experience-yielding monsters.
Rewarded Augment: Damage +3 Tachi: Goten DMG+10%
For me this trial is as much about recouping Tabs and some extra xp doing Fields of Valor pages, so I chose to go to Cape Teriggan and do Page 4 until I finished the trial. Wherever I was at when I finished I simply went to Jeuno, started a new trial, and picked up the page where I left off.
Best place Don't bother going normal fighting at these. Just go abyssea and use Regain atma: VV, Sea daugther and sundering slash for +10 regain and u should be done in notime!^^/