This Chami is tough...

I always participate in the Grade races, but my score hasn't been improving lately... I used to be able to maintain a score just below the top players and slip into Group B, but now everyone's focusing on US/UA scores and I'm still stuck in UB... Is my training method not quite right? Are my inherited skills not as good as I thought? Are my support cards old and not fully awakened? Or is it all of the above...? How is everyone else doing?