From compact to mirrorless: video focusing

When i compare my hx5 with my nx1100 i notice that AF in video seems a lot better.

Since i recently started considering more factors i may have understood the cause and a way to fix it.

Both cameras uses CDAF but have a very differente DOF. When I use  the NX i tend to use the wider aperture i can to gather more light and take full advantage from the large sensor. This make AF harder and slower. Now, wherever i can, istop down by 2 and i get far better AF!

Consider that i am not a "videographer" by any means. All i do is document some family scene so no need for focus and bokeh techniques in my videos!