Thanks for sharing, I am always interested in what guys do with their knives, especially when they really do use them all day at work. Is the Rat-2 a fixed blade or another folder like the Rat-1? I can't recall for some reason.
I too think AUS-8 is a nice middle of the road steel, and as long as I know I won't be away for several days or something, I really don't mind touching up my knives. I enjoy it in fact.
Lately I have been carrying a Rat-1, Utilitac II (I think for right now I slightly prefer it), Opinel #10 (my favorite size of Opinel). I have a few go-to favorites from Kershaw's expanding line of budget/value blades that for me really perform beyond their price point (I'm not constantly cutting stuff all day like you, however). I do use my knives to break down my fair share of large cardboard though. The Utilitac has been pretty great at this actually.
Other than those, I like a Buck 110, Case Sodbuster or other classics. I have a strange habit of going to two-handed opening knives, particularly those I can belt carry. It isn't exactly ideal, as I use a cane in my right hand and it can be tough opening two handers unless I'm sitting down or leaning against something. Logically I should really just stick to one-handed opening knives, for the sake of convenience. But there's just too many classic, nice two handed knives I like to give up on them for convenience sake. It'll probably come back to bite me one day.
I haven't heard of the Avispa, I will check those out.