Yes, insoles will be the next search for me.
Side Roll Stiffness
So both sets came, the Tibet GTX Hi (checking it out) and Kenetrek Mountain Extreme (both non-insulated. Both feel very good but interestingly read on an Alaskan outdoors forum about their experience with the Kenetrek Mountain Extremes being a little softer when sidehilling for extended distances. So I did my highly scientific field test (in my dining room) of simply rolling my ankle to the outside out of curiosity.
Low and behold, there is a rather big difference in the stiffness of the boots, at least when right out of the box without breakin. Lowa on left foot and Kenetrek on right.
Images show: flat on floor, Lowa ankle rolled out, Kenetrek ankle rolled out, Both ankles rolled out
Actual field test may vary but out of the box there's clearly a notable stiffness difference. Whether it's important or not for each person is up to them, but figured it's nice to know.
Waterproof Tongue Height
Both are about the same total height but the Kenetrek tongue goes all the way to the top while the Lowa stops a couple inches lower.
Cheers,
Steve