[bagofcrap24]

So run build 1101 and replace the firmware with that from 1106 then perform tests?

Yes, using a working buid with firmware (start.elf/fixup.dat) from latest build should be fine for testing.

Even with 0xf there is still some artefacting with mmal. Though it is much less often.

Even at 0xf I'm not seeing any video lag

Edit
I'm lying. It's heavily effected by what you watch.
Pretty much anything with panning shots.
E.g. nature/sports it will cause artefacts every few seconds.