This my designed 4" Toothpick that I call it "Monster". All the parts are free to download on the links bellow.
There is also a Square Frame design, check it out on the Cults3D links below.
It's running Betaflight 4.1.1 with JESC 24Khz on ESC's. You can download my tunning on: https://drive.google.com/open?id=1U8w_BVb1w-j2r8B2pWaH1o7YnzDbXbDS
You can see it flying at:
If you liked this, please consider to buy me a coffee at https://www.buymeacoffee.com/rodrigosclosa
Have you upgraded to 4.2 yet? If so, I'm wondering if you can post your "diff all". I have the same AIO board.