I'm having trouble with my two half rolls in opposite directions, and I'm looking for some online coaching.

I keep losing my line....for example, going left to right I'll roll left, pause, roll back upright and I'm angled away from the flightline about 10 or 15 degrees. What am I doing wrong? Has anyone else had this problem, and did you find a practice trick or key to help you through it? Besides "burn lots more fuel"...I know I need to do that.
Thanks,
Scott