I flashed my tinyhawk 2 to betaflight 4.1 last night and flashed the esc to jesc to get rpm filters. It felt really odd afterwards but I was getting almost an extra
FPV Drone Journey | Betaflight 4.1 RPM Filters TEST | Day 36 - YouTube
RPM Filtering Setup
Betaflight 4.1 and the RPM Filter - Patshead.com Blog
How to Setup RPM Filter / Bi-Directional DShot in Betaflight - Oscar Liang
Betaflight 4.1.1 Bench Testing RPM Filter Bidirectional DShot Loop Times And Motor Protocols - FPVBook - Your FPV Drone Pilots Social Network Community!
My "Ultimate" 5" Freestyle Build (Betaflight 4.1 RPM Filter)