Autotune with payload or not?

Sorry if this is been answered but I have a basic tuning/autotuning question: Should I be autotuning with my payload installed? Reason being if there are catastrophic issues I’d rather not damage the rather expensive device I’m flying. If I just use the equivelent weight will that serve the same function or do I even need to bother?

With. You just need to find some stuff the weighs the same. maybe a couple of LiPos. Use that.

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Or you can autotune without the payload to get the best performance, then change these parameters down to suit the payload. This way you can have one tune and just change 3 params for different payloads (if required)
New ATC_ACCEL_P_MAX = ATC_ACCEL_P_MAX x (min_TOW / max_TOW)
New ATC_ACCEL_R_MAX = ATC_ACCEL_R_MAX x (min_TOW / max_TOW)
New ATC_ACCEL_Y_MAX = ATC_ACCEL_Y_MAX x (min_TOW / max_TOW)

Exact digits and decimal places are not critical, you can just round them down somewhat, so if you calculate the new ATC_ACCEL_P_MAX = 87563.4 just make it 87000

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