Bushi Kit - Balanced? Comments Please

BUSHI: Bushi are masterless warriors, men without ties to a lord, temple, or monastery. They are commonly mercenaries, bandits highwaymen, or wanderers, earning their money however then can. They can be found serving samurai, protecting the court, or swelling the ranks of armies. A few may be kensai who have fallen by the way. Most, however are men of low birth who have chosen the way of the warrior to advance in the world

Advantages:
- +1 bonus to Armor Class at 1st level, plus an additional +1 bonus every 5 levels.
- 10% bonus on all experience
- May use Ki ability once per day per level (starts at 1st level with one use).

KI: The bushi temporarily raises his effective level by two for one turn. He temporarily gains +15 HP, +2 THAC0 and -2 to all saving throws.

Disadvantages:
- Race restricted to human
- Can't wear armor heavier than splint mail