AT,
You're right, he hit well because you're a great hitting coach! :P That must be it. Oh and every RHP he faced was horrible v RHB. 8-)
However I will point out that in your park IF you roll on his card every time, he would be expected to hit < .275 v RHP and only .297 v LHP.
Those numbers say he overperformed for you. Just sayin'
Of course, it's not unusual for someone on every team to better than expected so I'm probably just picking on you.
Jet