Yeah, i have same thing with rushing, and especially having too much stuff going on at once is a bad habit for me. That's one of the reasons i've been trying to adopt a sort of pomodoro technique with music, i.e taking breaks while working on a track so i can listen with "fresh ears" and hear what sounds off.
One of the best resources I've found to be really helpful on all parts of composing for me, have been Alan Belkin's mini "lectures" on YouTube. Some of the material might feel a bit dense at first, but he has some wonderful lectures on making transitions across parts work, climax parts feel fulfilling and other good stuff. He's teaching style of showing examples of different ways to accomplish things and some that don't really work, instead of just "do this or its bad" has really helped me understand some concepts.
The videos are sort of "companion" videos to his book, but you don't need the book to follow along (i don't have it, but intending to probably get it)