I have 372 acc in my usual DRG gear without food or buffs. I occasionally will miss a WS on Princess, but I start Doomspike combo for guard pops early enough to make up for a missed True Thrust just in case this happens. For Garuda I do use acc food and am happy with my acc for that fight.

I don't run a parser so I don't have any numbers, but the activation of DRG's reactive miss abilities helps with eyeballing your acc.

I use the stat caps as a guide for gearing, but am otherwise not particularly interested in min-maxing from encounter to encounter. I do carry atk and acc food and a pair of acc rings to make adjustments. Where I use DRG now, I only use the acc food for Garuda and haven't used either acc ring since the last WS acc adjustments.