@HuckingFuge That's what I get for early morning posting, a lack of proof reading.
But I still stand by most of my points, I would not cut off the last 3 weeks of my cycle, just to switch to prop. If I ran 12 week cycles, I would do 12 weeks on, then 3 weeks of prop, rather than 9 weeks on, 3 weeks of prop, just so I could stay in the bro-science 12 week range.
Bottom line is this, you should take bloods when you are figuring out what cycle length works for you and when to start your PCT. Don't be afraid to experiment on yourself a little (provided you have good support for doing so, I have a coach who is very exp with AAS who I can defer to, should I have any questions). I found for myself, I was not at max gains in 12 week cycles, so after some blood work and talking to my coach, I decided to try and extend for 15 weeks. My next cycle, he talked to me about using a short ester to safely prolong my cycle to see if I could still get gains while waiting for the long esters to clear. Having had success there as well, I now run 18 week cycles. I find if I stay in the 15-18 week range, I only have to run 1-2 cycles a year, which is what I prefer.