Makes perfect sense,
very enlightening!!! thanks.

I will do some empirical testing. I don't have a proper stress gauge, so I will use a fish scale for now

I will try my existing setup, buy a current/ voltage meter (or watt meter). I can put on the battery and measure static thrust with the standard setup.

I will then try the 4s battery and will slowly increase the throttle until it reaches a too-high point or is acceptable (doubt it). I will measure current and stress to make sure I don't burn anything in the process.

Then try other props and measure the same things.
It will be an interesting experience.

Thanks for the lesson!