What's your start and full settings and pump pressure? I would switch to the 225. For what it is worth, I was not successful running 100 octane map on pump with k03. The damn thing spooled too quickly to get the right spray setting without having dangerous CFs using a MAP based controller. This was with a single 225 mounted after the map sensor and pre-throttle body. A single 375 would have been too much. I never did try a dual nozzle on k03. Dialing it in on a GT2860RS was a piece of cake being MAP based.
Thanks for the reply.
When you were stage 2. did you notice 0 timing after 5000rpm?