Vomero Plus feel sluggish — sizing issue or wrong shoe?

Hey guys, need some advice 🙏

I originally had the ASICS Novablast (loved them) but they wore out, so I bought the Nike Vomero Plus as a replacement.

The Vomeros are super comfy, but I’m finding them a bit heavy and sluggish

Now I’m stuck between:

•	Returning the Vomero Plus and going half a size smaller (would that actually fix the sluggish feeling?)

•	Or just switching back and buying the Novablast 5

For context:

•	Female, 58kg

•	Training for my second half marathon

•	Goal pace \~6:10–6:30/km

•	Already using Zoom Fly 6 for speed sessions

Has anyone had the Vomero feel slow because of sizing? Or is that just how the shoe is?

And if you’ve tried the Novablast 5 — is it worth going back?

Thanks!! 🫶