EDIT: I just saw your later comment on your previous goat hunting experience and your dislike for Koflachs, so I'm cutting this down to comment on the Tibet GTX Hi only, by relating my experience with the Lowa Sheephunters.
The Sheephunters were specially made by Lowa for Schnee's and are essentially a deluxe version of the Lowa Hunter GTX Extreme. The Hunter, as you may know, is a step up from the Tibet GTX. The Tibet GTX Hi that you're looking at is the same height as the Hunter.
After taking the Sheephunters on an elk hunt in Colorado, I came to the conclusion that they are closer to elk hunting boots than sheep boots (much less goat boats.) I know there are folks who have used them for sheep, but it wouldn't be my choice. They're just a smidgen too soft for my liking on sidehills. Like every pair of Lowas I've ever put on my feet, they're supremely comfortable and amazingly well constructed.
Mind you, I wore Pivetta 8s, Raichle Montagnas, then Limmer Standards for several years as a SAR dog handler. These are all stiff, stiff boots, which I like for steadiness underfoot in the dark with a pack.
I love Lowa boots. I have yet to find someone who has owned them and didn't feel the same. It is of course essential to get a good fit for your particular foot, which you already know!