It depends on a lot of factors. Everyone else has their opinion and neither is right or wrong for you. You have to end up somewhere in between. So IMHO...
Your graph is spread too wide, too much ramp time, too much daylight (7hrs to get to 65%) then you only hold that intensity for three hours. Your corals should be receiving 7 hrs at 65%. You have 16 hours of light for what you could do in 10. People will argue with me about natural cycle and truth is it doesnt matter, neither is wrong or right, but most corals can only synthesize 7 hrs of sunlight based on maximum intensity. So if its 65% intensity for your top corals they will capture all the light they need in 7 hours. Some will need less or more but not more time. You have to figure that out based on the conditions of your corals. You move those that need a higher par value higher in your tank, or you increase your intensity to accommodate the higher par requirements. Once you figure what your intensity percentage is it should never change. You may have some corals that at twenty inches deep can only handle 80% for seven hours, but in the same venue the ones that are higher up should be able to handle the higher par values at 80%. Does that make sense??
Your ramp times should be within two hours, two hours ramp up and two hours ramp down.
So cycle
12pm-ramp to 65% intensity by 2pm Maintain and hold 65% until 9pm Ramp down to 0% by 11pm.
Your time can vary the cycle anytime within the day that suits you. I would focus on the times your are most at home and viewing your tank.
