This is what I used for ~4 hit (requires some STP for WS, can't remember off the top of my head how much):
ItemSet 326867
Store TP +5 on dagger, /WAR, and you get Fencer. However, on any evasive content I drop back to 5 hit, and overall I'm not sold on 4 hit for Yoichi anyway. It's ok but you give up a pretty good chunk of other stats to hit your Store TP target. I did better in-game and on spreadsheet, dropping back to a 5-hit /WAR with relic body, and you can do WSD on dagger instead of STP. That depends on target/buffs obviously. I'm a pretty newb ranger so take my words with a grain of salt, but yeah :)