First up, turn off the SR and use a Tripod or Camera Rig, big improvement straight off.
The SR does introduce blur in my experience with my K-01,.. which is only about a month more then yours.
The method of stabilisation that Pentax have used is the same as Steady Shot for pretty much every regular video camera.
As far as I know, the only Video camera's that do Steady Shot in the lens are the Canon XL series, and I think a Sony series, where it's called "Optical Steady Shot", and none do it by moving the sensor.
Quote: I can only adjust EV and ISO
Menu - Video -> Exposure setting.
From the above, I'm betting you've got that set to "P", or your using a K or KM lens.
In P and Av Exposure settings, when you press the +/- button, you see the EV adjustment display. In both of those modes, it's like having the ISO, shutter speed and Iris set to full auto, which means the vision gets brighter or darker depending on what your pointing at.
If you're using a K or KM ( M for Manual,..) lens, even in the "M" setting for Exposure, you'll still end up with the ISO ramping up and down. It's a pain. The solutions are using KA lenses, or hoping for a firmware change.
Under that same Video (film camera icon) menu area, make sure the "Movie Capture Settings" are set to "FullHD", and the Quality set to 3 stars.
If you open a .mov file in Quicktime Player, and open the Movie Inspector under the Window drop down, One star shows 10Mb/s, three stars shows around 20Mb/s
Frame Rate should be set to what's correct for your local area, 25fps for PAL, 30fps for NTSC, and 24 for 'film' projects.
So far I've used it to film things as diverse as a concert pianist, sports cars at a grand prix track, wrestling, rock bands, drone camera tests, mock light saber duels and a few other oddball moments.
I'm finding the Muted setting is useful in matching other footage in the Colour Grading process for film projects, and the Natural setting is good for TV use.
There's also one other thing to check,...
Are you running the focus manually? There are other comments on poor auto-focus performance, especially with those camera's still running the firmware they were shipped with, and appreciable improvements with the v1.03 (current) firmware.
Regardless, it is better practice in video and film to run the focus manually.
I bought mine primarily to do video, and beyond some minor niggles, I have found the image quality for video to be the equal of every DSLR I've shot with, and the form factor is good training before I get myself a BMD Cine Camera.