I'm not sure it would be as ineffective as you say, cav is really strong when you ride "in the wind" (manoeuver like a pro and always hit with maximum speed bonus) so you dont need as much power strike as other classes.
Then if you're a newbie I suggest you try to power up a bit more, but having more riding = faster / more manoeuvrable horse = more evading potential (less deaths) more speed bonus (more damage, more kills) ((IN THEORY))
I would like to try a build like yours once...