The R4 is not supported, why did you do this? If you think the problem is the fan, just disconnect the 4th wire (I think its blue): gently take it out of the plastic plug by using a small flat screwdriver to let it lose; then the fan will be at 100%.
According to the Braiins page, the R4 is supported. Their support has confirmed this and added that they have tested it on multiple R4s. I will have to try removing the 4th wire, thank you for the tip! Can it be reinserted without damage?