Brad,
If you have never been to Kabetogama, you are in for a treat! The advice to get a guide for a day or two is valid. It will not only show you the patterns that are happening at that time (they can vary a week or two depending on the year and/or water temps), but it will also give you some level of comfort as far as to where the rocks are and how they are marked.
The lake is full of rocks, but once you understand the flow and the USCG system for marking, it will GREATLY increase your comfort level on the lake. When in doubt SLOW DOWN and watch your electronics. I mean off step and at idle.
The time of year you picked should be both good color and great fishing. By that time the water temps should be in the lower 60’s to mid 50’s. I have always said that once the water temps hit 60 degrees, hang on as the fishing is about to get good!!!