Any advice with regard to new spikes

Apologies Nike not bike**

I'd get the New Balance MD-X.

If you're limited to Nike spikes, you'll need two - Dragonflies for the 800, and Maxflys for the 400.

If a lot of people say the Maxflys work for the 800, then why not use them for both the 400 and the 800?

wasnt sure if they suffered from the same "squishy on turns" airbag issue that the vics seem to have so was attempting to see if anybody had experience with them indoors

I run even 60m with Dragonfly, they are perfect for 400m. Vicotries destroy my calves on last 100m.

I think max fly’s are perfect for 400/800 guys. Lots of top 800m guys wear them. I like my dragonflies but not for 400/800. They feel too squishy once you’re getting down to considerably under 4:00 pace IMO

Also, less shoes You run with, better it is.