This is how I think of the matter:
If I get a very good down- bag, I have at least 700grams-1kg extra for a better tent - ie I could go for the Nallo 2GT and have a spacious vestibule even when hunting alone. I spent 48hours in a small tent in very bad wind and rain in NZ ten years ago - at that time I wished I had a bigger tent!
I also have 3/4 Exped down mat - save 200 gram from full lenght, making it a viable choice over other rests. Single closed cell mats are no option for me.. I'm hunting and doing the hard yards while enjoying it- it's not an army operation. Good gear, together with fitness, go a long way to make it more fun.
I'm a much better hunter on day 2-5 if I can sleep well at night, and get a good rest, without worry about getting wet.
This is not a cheap solution at all, but I'm willing to pay the price to have good AND light gear for the rest of my years of hunting.
Are there any other light, but still safe, tents for alpine use I should consider? Or should I just stick with a Hilleberg?
this one is also an option - better security, but one-man tent...