Make sure you have the newest version of the Miniscope DAQ software (version 1.11) and replace the videoDevices.json file in the "deviceConfigs" folder with the one attached. This should add both a 2FPS and 5FPS option for V4 Miniscopes.
Let me know if you have any issues doing this. Also, I would be very curious to hear if you are now able to see good vasculature now. Let me know once you have tried it.
I will also add these additional FPS options in the next release update of the software.