I have been flying a Calif (90 deg flaps + spoilers) for many years,
and I didn't had any problem going from 90 deg to 8 deg on very short
final (and the flaps actually go 90 to -12 to +8 durig this procedure)
something like 15m above ground. Doing so took 1-2 sec typically.
Although the Calif flaps are the most powerful I've ever seen (flaps
and spoiler amount to 15 sft perpendicular to the slipstream...), they
have the backdraw that youi change lift, drag and attitude at the same
time, which needs some training.
Today I fly a Ventus C with standard SH airbrakes, and I never had the
feeling that I should want more powerful airbrakes.

Btw, the distance of the ground run after touchdown has little to do
with flaps & airbrakes - it's a function of the spped at touch down,
and your gross weight.

Bert TW