Has the water flow changed on them at all?
Yep,i read this also,from many sites....your trates are 10 now,just curious if you knew what they were before?...i read between 10 and 15 ,maybe up to 20 is fine for shrooms and even good for them.....i think they will be fine though
I bet the upgraded lighting might have made an impact. An increase in lighting means that the mushroom doesn't need to expand as much to collect the same amount of light.