I also love my Hex-Nail, welcome aboard!
Regarding nails for the flat coil, I would say 30mm V3 Liger (+ insert of your choice).
Either SiC or Sapphire is superior to the Quartz in my experience.
I also like the D-Nail Halos (I've used all three: Quartz, SiC, Sapphire).
I still have a SiC Halo...