The only thing that I find about mxp with the new ball is that, it is not as fast as before and the spin is also less compared to newer generation rubbers. Yes mxp is still good but there are lots of newer rubbers with faster speed and better grip.
i see the connection of practicing eskrima and table tennis. the speed of blocking the sticks swinging at a fast rate will help you sharpen your reflexes (Balintawak Arnis).
Yes, O7series is factory tuned just like any other rubbers especially from ESN. You would feel changes especially if you have been using it for a month.