The P47 strafe is actually not far off from where all call-in planes should be. I actually like the idea of having a single pass with a much lower cost and slightly better tracking. If multiple passes are retained the tracking should be improved slightly. For such powerful tools with area denial I prefer that the passes happen just once so the game can move on, and to prevent them getting to snipe away vehicles with little player input.
I like this idea - a cheaper/more accurate single pass would give it more reliability and actually allow you to use it in team games where multiple OKW players make the ability more or less useless if RNG doesn't fall your way. It might also be cool if there was some Pathfinder synergy (like some kind of Mark Vehicle ability that increases the Rocket Accuracy/Damage)