Remember that your free chlorine should be between 5 and 10 ppm with a CYA level of 70.

Your alkalinty is pretty high. Does your pH drift up steadily? If so, you might want to lower your alkalinity (the procedure for doing that is here). You might want to start a new thread in that forum to seek advice on a target level.

Other numbers look good. It's obvious from your questions and responses that you've been doing your homework.