Car is a 2006 MK1 Fabia VRS with 104,500 miles on it.

Just doing a bit of playing around based on some information I have come across through googling. I'm trying to establish the cause of my rough idle

Looking at the group 4 data in the following video, through idle seems to occur when the engine speed fluctuates between 840 and 819 RPM. Any thoughts what could cause this and could this be enough of a fluctuation to cause the car to shake or am I putting 2 and 2 together and getting 10?

Also the following picture shows info from group 13 (injector value, if that is the correct terminology?)

Whilst these appear to be within the tolerance stated in VCDS, could this provide any clues to the rough idle?

Thanks in advance for any help or input.

I'm struggling to get the video to work sorry chaps, hopefully you can see it.