Have you tried walking up a mat about hip height while holding onto the bar for your pullover? This is a drill my coach taught me & I now teach my students. Hold the low bar while close to it & walk your feet up a mat or blocks...when you get your feet to the top of the block, kick off & over the bar. Also, make sure you keep your upper body close to the bar while doing all of this. I hope this helps. Good luck!