OT Window AC, put screen over outer vents?

Those terms apply to what is happening to the Freon inside, not the moisture in the air.

so your little 8000 BTU runs at slightly less than 300 >CFM and a 5000 BTU at less than 200 CFM."

The window a/c's use coils of identical cross-sectional, nearly the same h eat exchange area and operate both at about 20o differential to ambient, wh ich means the air mass flow rates (CFM) are about the same for energy balan ce. Granted the condenser side will be slightly greater to account for the additional cooling of the compressor housing due to I2R, friction and magn etics losses- say 20% additional.