We know they reverted to old floor spec for Saturday. Horner explains it was to remove a source of error, so Suzuka will probably see the new floors return
they used the old floor spec in the race:
“[the performance deficit] wasn't in the floor, as we now know. We only removed [the new floor] to eliminate a source of error.”
On the topic of RB's cars having a street circuit weakness over the past couple of years:
"It has actually been a very useful lesson for next year, because it gives us some very useful insight and certain things that hopefully we can address in our RB20.”