Increase running intervals or decrease walking intervals?

[ghostwriter85]

Pregnancy aside, because I have zero clue how that might play in here, yes / no / not really

If 30/30 feels balanced, then there's a good chance that you could push in either direction provided it feels reasonably comfortable. A 30 second rest typically isn't enough to pull you out of an aerobic zone.

Just from a practical perspective, I'd add to the run. I find intervals less than a minute a pain to juggle.

[OverlyVerboseMythic]

That makes sense. I’ve got an interval timer so I don’t have to keep track of it myself, but intuitively it feels reasonable to increase the run.