Awesome. Good. Good. Good.
Hydrometers are faulty by design, even if they are brand new. They have a multitude of inherent errors; and they work best when the errors cancel each other out... which isn’t always the case. The Refractometer will steer you correctly. Just ensure that you calibrate it.
The mushroom could also be pissed due to temperature. I’ve found that mushrooms are often the first ones to get pissed when temperature gets over 79*F, so at 80* everyday, that could be a contributing factor. If you can lower that range 1-2*F, it will likely help... even 77*-79*F should be much better than 78-80*F. However, I acknowledge that other people have other experiences and opinions.