in order to have "flush floors" with slide open, the slide has to move "up" and "in" so slide floor raises above inside floor so it does not ride on the coach flooring (and mark up floor) as it comes in.
also with Schwintek I highly recommend using
CRC Power Lube with PTF to lubricate the slide mechanism.
and
3-in-one RV rubber seal conditioner on all the rubber seals. This lubricates the seals and slide moves easier. I think you will use 2 cans of the slide rubber lube for each can of the CRS power lube.
I really would see a difference every time I applied the seal conditioner.