Kent switched from 5 to 4 a couple of years ago because he felt it improved his timing.
The key words are “he feltâ€. Try it, and stick with whatever feels comfortable to you. I’ve dabbled and noticed no real difference. IMO, if the timing of the push away is the issue, changing the number of steps won’t solve it. As soon as you stop paying attention to it, your body will revert to its tendencies. At some point you’ll have to put in the work to practice just your push away, whether you’re 4 step or 5.
On the plus side, since I dabbled, I’m pretty comfortable bowling with 3, 4, or 5 step approaches. Variety in that regard comes in handy when you’re going around ball returns.