That's a nice progress, Jeremy @jmillan! You are getting very close to the finish line, looking very sporty!
Semi gloss (or semi flat...) clear coat is always a safe choice. I think IJN grey was towards the glossy area when applied new, following the satin, towards matt, road due to operational and weather conditions.
Having said that, a matt finish will also look natural at your nicely weathered Zero.
So, bring out your choice for us to admire!