Forearm layback or bounce is the EFFECT of velocity, not the CAUSE.
IOW, if videos of you don't show any layback or bounce, then that means that you simply aren't throwing that hard.
I use the amount of layback or bounce to get a sense of how hard a guy is (actually) throwing.
In terms of what to do about it, it means that you aren't generating much rotational power. That could be due to things like an inefficient stride and/or poor hip/shoulder separation (aka opening up too early).
Do you have a video you could post?