Random update because I can:
So I just found the perfect song to fix my too-easy round 3 D2 file issue... well more specifically, I found a new song to step for D4 that round.
So I unlayered the old D4 chart and moved it to D3, made a few tweaks and moved the D3 chart to D2, moved the existing D2 chart to D1 (that's how easy it was) and now I am finishing up the new D4 chart and everything is set
Nobody probably cares but I'm really happy with how it all worked out haha
EDIT- Because I'm in a such a good mood I'll share one of the songs that I worked with to make this happen:
People who have been paying attention can probably guess the theme for this round by now, but don't ruin it for anyone else please :P
(If you have an idea, you can PM me to see if your hunch is right!)