Bro its up to you. I have used Chaos while on cycle and PCT.
Here is what I could see being ideal for you.
Start it before your cycle and 2 weeks into, by 2 weeks in you should be really getting going and won't need it very much. So save the latter half for PCT. This has 2 benefits, it helps you get going before t he pH's really kick in. And you can take 2 weeks off stims to really let adrenals re-charge then you can bust into PCT with a CHAOtic bang!