Stocking list for 270g reef

[Mike-fish]

So the 270 is online and ready for new fish. This tank will be a reef tank.
Current stocking:
1 regal tang
1 cleaner wrasse
1 copper banded butterfly
1 six- line wrasse ( may be evicted)
3 blue green chromis
3 clowns

Planned additions:
Powder blue tang or Achilles tang if the right one comes along
Sailfin tang
2 naso tangs
Possibly a couple schooling banner fish

How does the list look any red flags? Will I be over stocked