This reply is based on my experience with my two Hilleberg tents (and one that wasn't mine but that was forty years ago). I don't have the Soulo, but I have the Unna and the Stalon, both 4-season Hillies, as is the Soulo. Any tent is subject to some condensation when closed up, and Hillies (especially the 4-season ones) are worse than most. It's just a fact of life, and I think it's worth it to be able to close out the harsh elements.
Many's the time that I've closed up the Unna against howling wind (I live in southern New Mexico, so rain/snow's not a problem, but the wind sure is), and woken up with condensation on the fabric of the inner tent--this in spite of low humidity. Once I open up the tent and shake out the sleeping bag, it quickly disappears. Same with the Stalon--case in point: Last December, my son, dog and I camped in the Gallinas Mountains--a high of 27F that day, and I'm sure it got down to 0F that night. We even brought the dog (GSD) into the inner tent, so we had three warm bodies in there with everything zipped up. The next morning, there was a sheen of condensation over everything inside the inner tent, but the temp was well into the 40's. Reluctant as we were to let the cold in, we opened it up, shook out the sleeping bags and all was well. Once again: Worth it!
I've read advice on wiping down the tent walls, and I'm sure that would help though I've never done it. What else helps is a taut pitch, and your photos don't show a taut pitch. I know you were at a a disadvantage, setting up in wind and having to deal with hard ground, but you'll simply have to do better than that. Those rocks you used as anchors look good and heavy, but as someone who fairly regularly deals with 60 mph winds, that wind can drag the lines right out from under those rocks--or maybe you were sick and tired of trying to tension the lines and just wanted to get back in the shelter of your Soulo? Next time, dig holes and bury them if you can't get stakes in. Most nylon tentmakers advise re-tensioning after half an hour--I do that with the Unna and it helps. The Stalon doesn't need it, and I don't know if the Soulo does.
Are you using Hilleberg's V-stakes? They're excellent, but maybe some of those nail stakes might be better on hard ground? I'm currently experimenting with titanium shepherd's hook stakes: Lawson's stakes UL stakes have bent on me, but Lawson has informed me that he'll be offering sturdier ti stakes soon--you might consider that.
Hillebergs are absolutely the best in wind and snow. Bar none. As someone who's lain cozy inside of a tautly-pitched Hillie, listening to the wind howl around the tent, it makes me think that the $600 (for the Unna--don't even ask me what the Stalon cost!) was maybe worth it, even if the Unna does make quite a bit of noise in high wind. I've heard that the Soulo is less noisy, and I know that the Stalon, be it huge, heavy, bulky and a mistake dating from back when I thought that the whole family would go camping with me if I just got a nice, comfortable tent..but I digress--suffice it to say that it's the consummate Hillie: solid and bombproof to a fault, unmoved by wind and weather.
In short, go out there and get some practice with setting up your Soulo. You have a fantastic tent for all sorts of inclement weather, and you have a tent subject to condensation. It'll get better!