Not so concerned with it doing knife edges. In a hover tho, it has plenty of control authority fore and aft with the elevator but once it gets a few degrees yaw the rudder just wont recover it. Tail wont wag, it just hammerheads over.
Good thing is that since I got it in my head to re-do the rudder I also got the bug to return to building and dug out my mostly built Kaos and got back to work on it also.

Finally figured out why I wasnt interested in building lately. I recently moved into a different apt. Got a pretty nice garage to build in but it is separated from the neighbor's garage by corrogated sheet metal. Needless to say any sounds from either garage sounds like its in the same garage.
The neighbors teenaged kids (gangbanger types) hang out in their garage every time I go out to do some work on my planes. All I hear is them yakking in spanish, snorting speed, and non stop making the most gawdawful gagging, hawking, snorking, and spitting sounds.
Sounds like a hayfever convention over there. I mean this is non-stop for hours. I assume its hours cos I can only take about an hour or so before I bail back upstairs and give it up for the day.
Needless to say it very much detracts from any enjoyment of building. I plan to take my camcorder out there next time and record em.

Rant over.