as we all know, we are all unique. each persons rate of aromatization is unique to that individual. however, one physiological commonality is that the aromatase enzyme is synthesized in response to elevated testosterone levels. as a result the activity of this enzyme will be dose dependent.
the answer to your question is some what multifaceted... a fact about the drug is that it possesses a 27hr halflife. IMO, the goal should be to provide stability with both compounds and ancillaries. in order to do this, we must be aware of the the half life of what we're administering. Outside of this is the circumstances that the drug will be facing as it enters the body. what i mean by this is the compounds and dosages being ran. the higher the dose of exogenous testosterone, the greater the potential for aromatase activity.
does that mean to just take more? not necessarily... more is not always better. too much of an Aromatase inhibitor (AI) will cause e2 to fall below normal range. with this comes a host of side effects very similar to that of high e2. balance is key here.
how do we know what our "sweet spot" is? first we start with some guidelines. if we're still relatively new to this world, we are still learning our bodies. as a result, hopefully you're taking it one compound at a time and being rather conservative so that you can pay attention to what your body is going thru. with that being said, the typical Aromatase inhibitor (AI) dose is going to depend on what your doses are. you start with the guideline amount and run it for a few weeks. if it's enanthate based (prop kicker or not) you should consider running bloodwork at week 6 or 7 to verify Aromatase inhibitor (AI) dose effectiveness. there are some private labs out there that allow you to do this without a doctors' orders. i'm not very familiar with the rules here, so i won't reference them (PM me if you're curious). one of these labs has a panel called "female hormone" panel. this gives a comprehensive metabolic assessment, along with the following:
Test serum
LH
FSH
estradiol
this allows you to see where your current e2 levels are at. if your Aromatase inhibitor (AI) dose is on point, you should be between 10-50. you will also get a glimpse at your total test levels. if your gear is bunk, you'll see it on paper. if not, it should be pegged out by week 6. (with a prop base / short ester cycle, you would run this sooner).
now, for me: running enanthate at 500/wk and aromasin at 12.5 EOD, my e2 levels are around 48-50. that's marginally high, but not bad. my sex drive and libido doesn't diminish at this point, but i like it to be much higher when i'm on cycle - remind me of being a teenager again. lol. at 6.25 ED for the same level of test, my numbers drop around 10 points +/-, which is much better IMO. when i run test at 750-1000 a week, i have to run it at 12.5 EOD.
here's some more information on AI's, if you guys are curious:
steroidology.com/forum/anabolic-steroid-forum/642940-what-ai-do-i-need.html