First proper cycle

Hi!

I just wanted to ask for a little advice.
I read the sticky for a first cycle, so know how to go about a 500mg test only cycle.

The thing is that i run 300mg for 12 weeks, so would I notice all that much difference with 500mg?

I was thinking to run 500mg and also 200mg deca ( with Arimidex ), any thoughts?

I run a trt dose of 120mg a week.

When i was running the 300mg, I did so without an AI. I got super puffy with it, like I had been drinking solid for 3 weeks.

In terms of goals, im more curious than anything, to see how my body responds.
I definitely have some extra body fat, although i am not unfit.
I have started on a circuit-style workout, to get come cardio and strength/conditioning. This style of workout seems to work well for me.

Cheers!