It's suggested using a plug with greater (surface) area than the wire being connected to it senseless.

I looked at some specifications of different bullits and the Amp increase capabilityis not proportional to the apparent increase in diameter (surface area increases by the ^ 2 of diameter) - changing from 6mm to 8mm only a 30 Amp increase in one example! .
I guess going to "oversize" bullits is advantageous to have surplus capacity because no doubt overtime, with the plugs being taken apart and reconnected, warpage and cleanliness will gradually deteriorate the available "surface" of the connection.

Not mentioned is the importance of the tension or the pressure of the physical connection, which overtime will also deteriorate.

I am leaning towards using a soft silver solder (lead tin silver alloy)as silver is more conductive, 10 AWG wire and 6MM plugs for a 200 Amp system.
I'll try to measure resistance, however multimeters ohm not low sensitive, need to setup a large current and measure voltages across and perhaps extrapolate to calculate actual power consumed (wasted) - to determine if acceptable