The bad thing about dropping temps to the 50's for a week is it kills the chlorophyll which is what causes the nice colors to come out. So the plant won't develope its full
terpenes the last week if you kill the chlorophyll, but you end up with great bag appeal. So thats the trade off there.
Back to the subject, I've never ran GDP, but my best yield with any strain came from a 4 week veg with topping and LST. I'm gonna start a SoG run within the next couple months to see which I like better, but I think either way will do great for yield. Good luck with the GDP.