Still tired even after usuing cpap.

Welcome! Nothing about those two charts jumps out at me as an explanation for why the one night was good and the other one bad. You could try turning your ramp off and raising your minimum to 7; that way you'd have the full benefit of your EPR of 3 all night. (The machine can't drop the pressure lower than 4.)

What kind of mask are you using? I ask because some people don't sleep very soundly if they have a lot of leaks. Still, it seems your leak rate was a bit lower on the bad night, so maybe that's not really an issue for you.

This suggests to me that the variation you're seeing from one night to the next may not be related to CPAP or to night-time breathing. Try doing some detective work on yourself to see whether you can figure out other kinds of factors that might account for the difference between your good and bad nights. I'd suggest you keep brief notes every day about how well-rested you feel and your adherence/non-adherence to these sleep guidelines:

• Keep a consistent sleep schedule. Get up at the same time every day, even on weekends or during vacations.
• Set a bedtime that is early enough for you to get at least 7 hours of sleep.
• Don’t go to bed unless you are sleepy.
• If you don’t fall asleep after 20 minutes, get out of bed.
• Establish a relaxing bedtime routine.
• Use your bed only for sleep and sex.
• Make your bedroom quiet and relaxing. Keep the room at a comfortable, cool temperature.
• Limit exposure to bright light in the evenings.
• Turn off electronic devices at least 30 minutes before bedtime.
• Don’t eat a large meal before bedtime. If you are hungry at night, eat a light, healthy snack.
• Exercise regularly and maintain a healthy diet.
• Avoid consuming caffeine in the late afternoon or evening.
• Avoid consuming alcohol before bedtime.
• Reduce your fluid intake before bedtime.

You'll probably be able to think of some other variables to track, e.g., interrupted sleep due to a bed partner or a pet.