You definently have a tuff growing season. I would look into a summer/drought blend grass.
I'm sure Scotts and other seed producers have some sort of blend. If you use mulching blades and don't cut grass that's 6 inches tall you shouldn't have any thatch build up..
But I thatch not to brake it up but to scratch the dirt/sold and pick up the blades of grass so the grass seed gets to the ground. Then use a drag rake to (old fence) level everything out. You should use a roller to get the seed contact with the ground. Water once to get the seed going. I don't think you need to core aerate before seeding.
Also leave the grass 3.5 to 4 inches high.. Keeps the soil cooler and moist longer. Plus it helps to keep the weed seeds from germinating.
Just my .02$
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