Actually for the controlled rise mass is directly a factor, the lift doesnt scale with it so F=MA ==> F/M=A Less mass (smaller ship) means more responsive. In a freefall you are generally looking at a flat 9.8 m/s^2 before air resistance. Given the size factors in lighter than air, air resistance is significant so you'd probably see the falling speed end up with squid and junker being slower while the spire would be a javelin (others are awkward to say too much on considering how they were deisgned for aesthetic not physics
)
Also main reason for replying:
Shinkurex have you ever tried the variant "dropping" experiment? It irks many.
Try dropping a moon and a feather towards a bowling ball in a vaccum, my earnings for this year say your argument falls apart when you use extremely different masses