I don't know about helping you choose a fly but do they see you? In those conditions (clear water, mid day, water not deep) the smallies are sometimes skittish. If they see or feel you first you may have a tough time. Our conditions are currently clear, low water, I fish at midday and the physical approach is very important. I have had a number of good size fish head toward my surface pattern, but if they see me first, I am done. May as well move on to the next fish. So, if you are wading try going upstream with as little disruption as possible.

Also during these conditions a natural color and not too big are also important. Since you can see them you have probably already done this.