At 180, maxing close to 300, 500mg is not enough for me to see nice gains...
I am 5 6 and a bit heavier then you. my next cycle I am gonna do 375 sust and 500 primo per week. if i dont feel the difference i can always bump it to an even 5. what i noticed with sustanon is the insomnia really became an issue which is a big no-no if you are gonna stay anabolic.
i would tell the OP to try that. and if you aren't happy after 3 weeks then you can bump it up. at 160 pounds i think you will be impressed with sustanon