It comes down to the texture of the strings tonal output and ones touch.
Most players would never use strings as light as I do on my standard tuned basses to go as low as I go, they feel that the strings has to be very heavy to give good solid deepness.
The down tuning you use must be very low.
I know Drop A ain't light either, but Drop A# and Drop Ab can't be so much in difference.. Or is it?