Here is some food for thought. IMO, it is not a good idea to set new power records every time one rides. It takes much longer for connective tissue and joints to respond to training than muscles. It is much easier to get stronger such that there is a higher chance for injury. Once you find the power zones that work, then stay with them for some time and gradually increase power. Indoor riding over the winter is a great way to build muscular infrastructure (muscles, tendons and joints), endurance and technique. Power can be easily added in the spring. Think of it as building a building. One can make the building taller if the foundation is solid.

I am always amazed at the lack of fans. You guys must cook in that place and lose a lot of water and I assume it is not that warm in there to begin with. I get hot at z2 power and need a lot of air blowing on me. At z3 and higher, I like to have a couple of fans.