East Lake is good, but we seem to be in-between the first and second brood of Callibaetis. The 2nd brood is smaller and when they hatch it is intense hatch activity for about 4 to 6 weeks. Usually very good from August to Mid-September but hasn’t totally rocked yet. The 1st brood was late due to a late ice off, so maybe that is delaying the 2nd brood? The 2nd brood comes from the egg laying brood in June and July and the flies are smaller in the 2nd brood because the life cycle is so short. When the 2nd brood lays their eggs, the nymphs will over winter under the ice and hatch next summer when the water temps get in the 50’s.
The Beetle, Ant, Hopper and Damsel action makes up for lighter mayfly numbers, but watch afternoon water temps where that will occur. 
Chironomid fishing is good under an indicator at 15 to 20 feet depth and in the middle of the day or morning. Colors and Sizes change but trends have shown a Red Ice Cream Cone, Black with Silver Rib, Chromie, and Olive Pupa will be good choices to cycle through. Seems like a fly called a hanging with my Chromies and Chironomid Assassin have my own go to bugs for success.