The Rochester basin has the best summer concentration of lakers on Lake Ontario IMO. You can fish from Devils Nose in Hamlin all the way to Webster Park and find lakers all the way through without skipping a beat. I took a 34lb 6 oz Laker in 2012 East Of Sandy Creek and Captain Bruce took a 35lb laker in the same area a couple season ago. Late August big lakers start to pile up around the shoals From Sandy Creek to Braddock Point and the Flats East of Irondequoit Bay. These two areas would be my choice in August. If you are coming to the Sandy area, I can give you reports! If you go to Oak Orchard, you will have to run 11+ miles East before you find lakers. Sandy creek is limited for marina space but you could always go to Bald Eagle and run East to find lakers. It is 6 miles closer to laker water than Oak Orchard.
P.S. If you are in the area but not fishing out of Sandy, you could always hitch a ride with me and I can show you the areas I fish out of Sandy.