Re: Warre population?
a traditional Warre, (no frames, top bars only) has slightly less room than an 8-frame medium. Each comb is about 2/3s of a lang deep. If your broodnest is most of two boxes that is a strong hive, easily equivalent of a 10-frame deep box.
When I inspect I look down into the combs and count how many combs (frames) are covered with bees. I jot that down and add up all the covered combs I have. I consider 75% very strong and likely needing another box.
You didn't say if you have all drawn comb from last year, but once the flow is on they should be growing exponentially. Mites are one issue that can keep them from thriving.
Hope this helps
Herbhome Farm USDA zone 7a