Just googled this cuz I was interested and I find bigkev's log! All caught up to speed now, great stuff and I am definitely looking for more logs.
I was just thinking of that same stack for myself man. It would be a GREAT sub-natty stack. I guarantee you would see a decrease in bodyfat with minimal drop in weight, thanks to the anabolism of the ostarine.
I would try and dose your GW-501516 before your workouts to get the added endurance benefit others have been seeing.
With that said, I would also remember to dose it around the same time each day as I am unsure of the half life, would be best to keep things consistent.
And why you only want a 2 weeker from the osta? Run it 4 brotha!
Week 3 is where the osta really started to shine for me.
This stack (maybe even add S4...MAYBE) is a definite on my to do list this summer.
Osta/GW/HCGenerate/Erase Pro FTW.