If the fan is not operating above 30 percent it seems that there is probably something wrong with it.
I could see a fan not operating UNDER 30 percent, not having enough juice to get moving. some slicers let you blip 100% power to get it rolling then cut it down.
Its odd that you have this issue and stefix also has to watch his high level. I wonder if the both of you got the same brand fan?
the placement of your chute is different than mine. Curious.
I need to take a good hard look at mine. Its not working very well in terms of helping with bridging anymore, and im not sure why. maybe it melted a bit.