I believe it was E rated boots with sidewall strength for your ankles. You are onto something there. Mountaineering boots have always had stiff sidewalls since I can recall and the originals we used to call waffle stompers. Normally made in Italy and some of the best still are.
From the 70's until ~25 years ago I wore Vasque Sundowners everywhere. Then Red Wing who owns Vasque moved production to China and they went to hell in a handbasket. 8 years ago I rolled my ankle badly in the woods and ended up bone on bone grinding in my left ankle and now degenerative arthritis in it. Ended up at Mayo Clinic Sports Med and they build custom orthotics for me along with cortisone and platelet replacement therapy injections. My days of busting brush for 10-12 miles a day and side hilling are in my rear view mirror.
I can only get 5-6 miles a day in with the right boots. Which are Crispi mountain boots and only the models with A.B.S.S. Ankle Bone Support Support System. They are marketed to sheep, goat and elk hunters. I live in them all year and all day.
When the ankle gets really bad I will switch to Kenetrek Eversteps which are the Mountain Extreme with fiberglass ankle support braces developed for veterans with foot damage. They are considered durable medical equipment so get a pair once a year through insurance but the Kenetrek last doesn't fit my feet quite as well as the Crispi do. Close but not as good.
All of the above are made in Italy.
View attachment 3733997
Took the FJ55 from Bremerton around the Sound to Seattle to join the REI Coop in 1980 it wasn't the flagship store then it was THE store.
Good wool socks with wicking socks under them help a lot with the heat even though it doesn't sound right it works. Can't help on the weight but eventually you get used to them at least I did. Rocker soles help also but they can take awhile to get used to them. Once I did love me some good rocker soles.