Missed my point, my friend.
What I said was that the 8.5 amp draw poses little to NO risk.
This is assuming that the 20 amp cell has been through enough charge cycles that it now only has a 10 amp CDR. (time to toss it in the bin)
New batteries are not the problem with mechanicals, it's the older cell that can be a catastrophe.
So the SAFE rule of thumb is to 'never' exceed 50% of a batteries CDR.
add:
The Provari mentioned for reference was the V1 Provari (2.5 amp limiter)
You said anything under 0.5 ohms will never be safe. So that eludes 8.4 amps is the limit and anything above poses a risk. Sorry if I did not dig that deep into the details.
My post was based on your theory but gave a different perspective. Let me rephrase - If 0.49 ohms poses a risk due to degradation, then the same theory must be applied to all resistances while using all CDR ratings. I am sure people use low CDR batteries with high resistance coils. If so, then the 0.5 ohm limit will pose the same risks as a 1.6 ohm coil with a 5 amp cell. Your 0.5 ohm limit is now moot.
Do you have concrete evidence that a 20amp call can degrade to the point where 8.39 amps draw becomes a higher risk?
And to add, the 2.5 amp Provari limit is at the coil. My example displays how 2.5 amp limit at the coil can draw over 5 amps at the battery. That’s how a regulated mod works.