Dosages are for the most part weight related and how sensitive you are to the compound! Some people can use less or more gear than someone else all things considered equal.
So a blanket statement of using 600mg is prob not valid but by using a higher dosage you might prevent someone who would not respond well to 400mg wasting their time with that lower dose.
Ive done 400 wk didnt like it, really didnt see anymore results then 500 test was giving, 600 seemed well...800 and at night id have weird breathing and anxiety...ill never use it again other drugs give better results at lower doses
I had the same issue and whats weird first cycle with eq was at 600 and 250 test while last cycle i ran 400/400 cyp/eq and anxiety/breathing was fucked up..i dont think im running it again I would get dizzy/naseaus from it
if you are below 8-9% bf you are going to look CRAZY hard and vascular after that! Why not a little more test, i would run the prop at 75mg ed if it was me.