Been my achilles heel lately with it getting too steep. Any tips on lowering it without screwing up timing?

What problems are you experiencing as a result of a high backswing?

The problem occurs when my backswing gets too high. If I can keep it consistent its fine. Just trying to minimize the problem with a lower swing.

Muscle and early timing? When have you watched me bowl, Rico? To the OP, just an FYI that this can be tough to fix if muscle and early timing are what's causing it. I've been working to lower my backswing for 5 years, and I just can't seem to fully work it out. As others have said, try to just let the weight of the ball move it through the phases of the swing. If you can do that, simple starting position adjustments may do the trick.

In line with what TWOHAND stated, imagine handing the ball to someone in front of you. You simply let gravity take over and let your arm swing without muscle  tightening (I would have used the term "push-off," but I understand from Charlest that "push-off" is a Dangerous word on this forum!!!)

One thing that greatly helps reduce muscling the ball is to have your non-bowling hand support the weight of the ball. If your bowling hand/arm is supporting the ball's weight at the beginning you're already muscling the ball before you take one step.

If done properly, like others have said you'll be swinging the ball from your shoulder(pivot point) and the ball(gravity) will naturally swing your arm, instead of you swinging the ball.