Welcome to the forum.

It is really hard to answer that without seeing, but it sounds a bit like you are finding yourself flat-footed when jabbin forward?

Overall, I think practice and conditioning will help with it, and getting used to transferring your weight properly. Maybe getting off the balls of your feet some? I mean, we are always working on that (transferring weight) and no one can ever get it perfectly right. So in a way, you have sort of answered your own questions, repetition, sparring, time.

Am sure some others will chime in also with differing thoughts, which is always good.