I started doing only punch, and I didn't get splitfoot at all. Now, after a few years of doing splitfoot.. I use them all the time! It's mostly a "it takes time to get used to it" thing.
The way I explain a lot of complex flow work is that parkour is all about keeping your stride. When you walk, you always step with the left, then the right, then the left, then the right. Never left, right, right, left, right, left, left. So when you're doing flow work (as a rule of thumb), always try to keep that alternating foot mindset. When doing a kong, you want to step into it to keep that flowy feeling, but what most people don't talk about is you also want to step out of it!
If you land with two feet, that's not a stride either. If you land one foot, then the other foot an instant later a step ahead, then you're already in that "running forward" position.