From your description it sounds as if your home and mine are substantially similar (same size, layout and stove location). Getting heat to travel up from the basement and around the corner to go to the bedrooms is challenging. Hot air will rise all by itself but it gets backlogged, the trick is to get the cooler air to travel back down and create a circulation loop. I have explored cutting returns into my walls to get the cooler air from the floor level of the 2nd floor with the bedrooms to the floor level of the basement near the stoves. Due to the layout of my walls I am unable to try this. Fans may help. In the future I may try to run just the fan on my central a/c (no compressor) to circulate air through the whole house return in the ceiling of the 2nd floor to redistribute it throughout the house via the duct system. Hopefully you find a solution that works for you.