For your training, I second the recommendation to go lighter on your training pack. It's not a bad idea to throw on 80 pounds on occasion and walk on the treadmill, just don't do it very often.
Also, a MUCH better workout is to put 40 pounds in your pack and do step ups onto a weight bench for 45 minutes or so. This is a great workout for your legs, much more so than walking on the treadmill because your legs are doing both eccentric and concentric work, which is what beats you up in the mountains.
I would only do this one or two days a week. The other days, mix in some biking, running, and other cardio work. If you have it, Insanity or P90X3 are great workout programs to get you in shape.
Try to do one day a week where you work out (bike, jog, speed hike w/pack) for 90 minutes or longer. This will get your body used to burning fat for energy instead of just utilizing its available blood glucose.
That keto-adaptation doesn't sound like a very good idea to me.