I have been to Lady Evelyn 3x over the past 12 years - once at Island 10 and twice at Garden Island Lodge. My last trip was in August 2018 to Garden Island. Joe sold GIL the following year.
I prefer GIL due to the central location on the lake.
I was a bit disappointed with the fishing on my last trip. Noticed more locals fishing as well. Of course, it had been 10 years between trips. We did alright, but not as good as the previous 2x. I would recommend bringing meat. While I almost always fish plastics for Walleye, I think the lake has shifted to more of a meat lake. Just that little edge should improve the fishing. Of course, that is based on a 1 week trip in August.
The best spot for us was "The Dome" (I think it is also called Four Corners) [47.276550,-80.202684]. Island points produced as well - not surprising[ e.g.,47.345926,-80.181109] . Caught fish quite deep at times too. The saddles between the island held tons of fish [e.g.,47.297350,-80.190486] . You would probably do well at these spots in the fall. I imagine Sucker Gut might be good too if the fish are migrating.
When we stayed at Island 10, the one spot I can recall was just North of camp. I don't recall exactly, but I believe it was probably the pinch point between the shore and the large island just west of Island 10 (my maps showed no name for the island)[47.384331,-80.156786]. It may have been the point just north of camp as well [47.389779,-80.143397]. I just don't recall.
Good luck!