Great news. I have the H&R front and rear sway bars. as well as eurocode strut tower bars. No other suspension mods. H&R FSB is on the softer setting. Will test on stiffer one soon.
I just did some testing, and not only do I still have ever EVER slight oversteer, I also have slightly higher grip. A corner that was slipping pretty bad before at 42mph now didn't slip at 42, and 2 other corners, one while moving, and one while starting to move (so under acceleration in race mode NOT drift mode) - I had oversteer. BUT not as much as before. i'd venture to say ALMOST non existent...
So the car is balanced really REALLY well.
If you want oversteer, and you want it to be controllable, then both sway bars may not be for you. But if you are afraid of understeer coming back, then I am here to tell you, that's not the case.
TL:DR; Oversteer is still a thing with both sway bars, just not so much. If you want oversteer for fun, or control reasons, avoid an FSB, if you want sharp grippy turn in and a well balanced car, with micro oversteer, get the H&R pair.