t1mmbo, your pond looks to be in a nice setting and the trees will help some for late afternoon shade.
Since your dead set on trout I would suggest connecting your aerator to a thermostat and keep it set to go on when the air temps go below the water temp., this could help keep pond temps down, and put your diffuser in about 4 ft. of water so you don't warm the deeper water. Bubble tubing might also be good for your shallow pond.
Since your pond is shallow with little cool water input it's gonna be a toss-up for trout, but every pond is different and it might work.
Another thing that might help is to add shade to your pond with islands, they can be made from sheets of styrofoam or other materials. A oxygen test kit will help you keep an eye on O2.
Here's the thermostat I use, Good Luck
http://www.amazon.com/WIN100-Heating-Coo...68438127&sr=8-1
