Quadcopter highly unstable with ANGLE_MAX set to 8000

[arduouspilot (Ardent)]

@xfacta

There are a lot of default values.
Definitely set more values by connecting to MissionPlanner, go to Setup, Mandatory Hardware, Initial Parameters
Put in you prop size and battery cells there, also select the other optional parameters check box (not the T-Motor Flame settings though) and accept everything it offers.
Apart from a bunch of filter settings, this will also set the Fence, meaning you cant arm until there’s a good 3D fix (which takes time, and that’s a good thing) but it will also set the correct battery voltage related settings and these babies:
BATT_FS_CRT_ACT,1
BATT_FS_LOW_ACT,2

Also set these before the next test flight, to even out the PIDs between pitch and roll and get some logging for the Harmonic Notch Filter configuration
ATC_ANG_RLL_P,6.5
ATC_ANG_PIT_P,6.5
ATC_RAT_RLL_P,0.12
ATC_RAT_RLL_I,0.12
ATC_RAT_RLL_D,0.0075
ATC_RAT_PIT_P,0.12
ATC_RAT_PIT_I,0.12
ATC_RAT_PIT_D,0.0075
INS_LOG_BAT_MASK,1

Also to help out the GPS module set this, it might also improve that wandering position in Loiter:
GPS_GNSS_MODE,65

Okay, I’ve read this now and the Arducopter manual tuning web pages. Do you just suggest I use the Mission Planner wizard to set these values and see how it goes? (Had no idea there was this initial tuning values tool in MP.)

Should I do Autotune as well? BTW, I did Autotune a year ago on this quad but without changing and default values as you suggested.

Basically, do I just need to fly the drone around in STABILISE mode to get some data which I can post back here?

Edit1: one more thing. Is current monitoring mandatory for tuning and flying? I ask because I have another bigger drone that I need to tune after this one and it has a faulty current pin.

Edit2:I don’t think I am at risk of brownout as the minimum voltage is 4.1v.

Sorry for all the questions. I’m aiming for a Wednesday flight if the weather is okay.