I’d start by putting these two lines of code where they belong - T the top of your sketch…
Then I’d read this…
Then I’d restore the board type definition lines of code that you deleted, and un-comment the most appropriate one, and check that there are no pin conflicts in Settings.h as described here…
I’d also check the min/max values that you’ve defined in your datastreams that you’re using.
When you’ve done that, post your revised code, your serial monitor output, and proper details of the values that you’re seeing in the OLED and app.
Pete.