TBtoad,
This is not the best time of the year for Macks, but I caught a 30 lb'er last year about this time. LUCK
Use Quick Fish, or anything that will mimic fish that look like small Kokes will work. Fish the south west banks 1/2 of the lake. Not to close in though. Close to the bottom trolling for Macks. Keep your line back behind the boat at least 125ft to 150 ft. Macks are boat shy.
I hooked about 20 incher earlier in the year chasing Kokes and shook it off.
That one hit a green apex.
Fish mornings for Macks till 9 AM or 10 AM. Then switch to Kokanee!
You can troll for trout if you so choose. Heavy planting for them a few weeks ago.
A few small ideas. Hope this helps, but some one may have more info on Wallowa and Macks.