What I'm proposing for the new cloud air density?
For your average storm calc, I'm proposing a cloud density of
0.6601 kg/m^3. That's the air density at a height of 6 kilometers above sea level, the middle of a 8-kilometer high storm.
For storms that formed much higher than the average one, or that are much bigger, I recommend measuring
half the height of the storm + the distance to ground, adding those results and using the above graph to find the air density.
Of course, clouds formed/dispersed from anywhere between 0 to 2500 meters above sea level can keep using the current cloud air density, my main concern is storm clouds.