I was finally able to return to Resolution this past weekend. The true high point is about 0.12 miles from the trail, and I found it to be thick going most of the way. I definitely wouldn't have found the spot the last time I was on the mountain. The open clearing is really the only open area on that part of the mountain (that I observed). The highpoint cairn was easy enough to find, but locating the canister took a few minutes, because as it turned out, it was tucked underneath some of the tree branches that obscure the cairn. I was thinking of leaving the jar sitting on top of the thick tree branches, but I was concerned that leaving it so exposed to the sun would cause the register pages to fade and the plastic bag inside to more quickly disintegrate, so I left the canister where I found it.
Overall, it's a lovely spot, but quite buggy when I was up there, so I didn't linger too long. Also, whoever treks over there next, please bring a new baggy for the register, because the current one is falling apart (but at least the inside of the jar was dry, and I expect it will remain so until the autumn rains). Please bring a new notebook too, since the register is down to its last fully empty page (please note that it's a small jar, so please bring a diminutive notebook).