Some constructive feedback since I'm in IT myself. XenForo 2 is a big step up from 1, I love the software personally. However, some pointers.
Most actual content on the mobile view is below the fold, you shouldn't have to scroll to get to it. I like ThemeHouse's themes and they look great but here are some optimization ideas for this theme in particular.
On mobile view, the top menu is taller than it needs to be, remove about 10px below ad (1). The menu collapses as you scroll down but should still be narrower.
Further down, although the thread title background is looking nice, it can be compacted as well, not completely but a good chunk of space can be removed up top by cropping the graphics (2).
Add a copy of the thread navigation (3) to the top of the thread, just below the thread title for useability. It doesn't make sense having to scroll to the bottom just to flip through pages, especially for longer threads.
View attachment 15810
View attachment 15811