R 980 whipple hat question

I have a r980 whipple that I'm running at 55%od.i have a buzzard hat with the radius plates put in to make it fit the blower opening an smooth out the transition.what injectors would make any difference on airflow an power with my set up.im running dirt drags an only run 200ft an less than 2.5 secs.an have always turned 9300.