Hard Low

I have been self learning a lot about running with diabetes the past few weeks. The last couple of runs really brought some issues to light.
Example: Today I tested around 2pm and was 275 gave myself a correction of 2.5 units and went on. A few hours later I tested at 75. Great, but was getting ready to run. So I ate a triple threat power bar and lowered my basal to 60% waited a half hour. Tested at 74. Sucked a Gu and took off. Mile 3 sucked another Gu and lowered basal to 40%. Ran back kept good pace but did feel quite right and mouth was super dry. Ran total of 6 miles and tested at 57. What is up with that.

Why is it so hot?

It has been so hot this summer. I have got used to running in the extreme heat. I imagine that I am running at Badwater when I go out and have decided the people that do it are bigger people than me. I always try to bring some water and stop a few times so I do not really over heat.
Things on the running with Diabetes front have been a little weird lately. I have been testing at normal before going out and after the third mile I have dropped low and my times and mind slow way down. This was not going on a month ago but all of a sudden. I know mile miles have increased. So now I am going to drop my basal rate down to 70% and eat a little more before I go out. I'll see if this works a bit better.