If your test was dosed at 250mg/ml then 1ml ever 3 days is just over 500mg. That's a pretty good dose to start with but I'm sure most guys don't stick around there for long. With E you should really run the cycle for 10 weeks at least, and just to clarify you are using an AI right?
IMO since you're close to 200lbs and have cycled before, I think you'd be fine with 750mg test E for 10-12 weeks, if you like start a little lower and bump it up around week 7-8 when gains start to slow down. Definitely want to run a-dex or aromasin with that though