No oxygen=no heat. If you are getting heat in rubber boots from these heat packs, it's because they are getting enough oxygen. You must wear your boots loosely. Walking will exchange air as well, but when they are starved of oxygen they shut down.
EDIT: went back and reread your post "...but once im in my stand i adjust my safety harness so i can reach my boots ..i untie the boots and loosen em up allowing warm air to circulate,while tying the laces thru the pull tab on the back of the boots..." That is why they work for you.
The only real difference between a good tracker and a bad tracker is observation. All the same data is present for both. The rest is understanding what you are seeing.