Your temps are much too low.
Hot side should be closer to 90 (88-91) and the cool side should be in the low 80(78-82). Your temps should never go below 75. Anything under 75 has the potential risk or respiratory infection.
Just bump up your temps a bit. Your humidity sounds good though!
As for aggression, try hook training your snakes. Use a paper towel roll or rolled up news paper to gently rub their head or neck to let them know you're there. Then gently scoop them up from the back or side. From my experience with snakes striking, its the fast movement of reaching for their heads that may trigger a strike.
And are you sure your snakes aren't defensive striking?
Do your snakes try to attack you when out of their enclosure when you're holding them? If not, then they're not aggressive, just acting defensively in their enclosures..