Frame build guide here: 

_{The following setting are specifically for the TuneRC Poly F405 Flight controller and AMAX 1102/9000kv motors on 3S ( 660-720mah batteries)}

Setting up the tune:

_{1.  In Betaflight motors tab, Enable BI-Directional dshot (300)}

_{2.  Set the PID values as follows:}

_{3. Set the filter settings as follows:}

_{4. Set the rates as follows:}

_{5:  Make sure the ESC's are set to 48khz PMW (firmware)}