Hi Rufo:
With X-H2S I find I do not have to over expose fLog by more than 1/2 stop. I expect the X-T4 to be similar. I follow this procedure to color grade in Davinci Resolve:
First node has FLog only.
Insert a node before the node that contains FLog. Here I do my main color grading. You want to do main color grading before the conversion to FLog as the changes you make will be linear.
If required, insert another before the node before the color grading node. This node will contain any noise reduction.
If you want to sharpen, insert a node after the node that contains FLog. I find a sharpening of 0.47 to more than enough. Any more and the image may begin to break down.
This should be enough to get you started.
If you want more, watch some of the YouTube contributors.
Don
I've had problems with the same Lexar SD card and having checked on the Fujifilm website it is not listed as compatible. https://fujifilm-x.com/en-ie/support/compatibility/cameras/x-t4/
I have ordered compatible sd cards and hopefully that will work.