6ft 225 at about 15% BF

Currently taking

test e 500-750mg per week
.5cc tren ED
EQ 600mg per week

Keeping this cycle to an 8 week blast

Having some very slight onset of gyno. I have all my pct layed out with nolva and hcg.

I wanted to know while on and I know I should of had this before starting and normally I would have but no excuse but should I take an AI while on cycle or only as I need it? And if so...arimidex? Aromasin? Letro?

Thanks boys