Your not the only one. I had Bilstein PSS9 coils and the APR 27mm hollow RSB and still way too much body roll. I couldn't go any stiffer with the rear bar or I'd get too much oversteer, and any stiffer with the front swaybar and it would understeer at the limit.
The problem is this car is just too heavy. I can't find the spring rate list right now but I did the math before and essentially the springs are too soft for how heavy the car is. Even with the Billy's they would be fully compressed in a corner and the coils would all stack up and bind all the way to the top. When I took them off I could see marks in between the coils where they were rubbing.
But nobody makes a decently stiff suspension for the MKV. They're all soft. Sure they make have some pretty stiff dampeners but the spring rates are never above 500 lbs/in. And you've got about 1,000 lbs on each front wheel so it'll go down 2 inches just from the weight of the car. Then in a 1 G corner, if you can do that, you get another 1,000 lbs on that side so it goes down another 2 inches. So that's quite a bit of suspension travel and body roll for a hot hatch. I mean you help it a little bit when you put the swaybars on but they are really just hiding the problem which is inadequate suspension. Everybody wants something that is comfortable and rides smooth and they think that you can't have that with a performance suspension but it just isn't true. A properly tuned suspension will be very comfortable and doesn't have to be harsh or bouncy. It just means you have to work harder on the shocks. There's as much technical stuff in suspension tuning as there is with engine tuning most companies for VW just neglect it.