I can already see your estrogen is high because you are on Test and you are using HCG. Also as mentioned below it depends on how you aromatase based on your fat percentage.

First question I’d ask is body fat %. That alone changes the entire equation.

Higher body fat = more aromatase activity = more conversion of testosterone into estrogen. Two guys on the same dose can have completely different E2 levels purely based on body composition.

Also, if your free T was already high on only 200 mg, that tells me you’re a strong responder. Free T north of ~30 pg/mL is already supraphysiologic for most people. Doubling to 400 mg without understanding your personal aromatization pattern is how estrogen gets out of control quickly.

Before jumping to AIs or adding compounds, there are a few important things to understand:

1. Free T matters more than dose
   Dose is just the input. Free T is the actual active hormone. If your free T is already high at moderate dosing, increasing dose will increase estrogen conversion proportionally.

2. Body fat is one of the biggest drivers of aromatization
   Leaner individuals aromatize significantly less. Dropping even 3-5% body fat can materially reduce estrogen levels without adding anything pharmacologic.

3. Injection frequency helps stability, but total dose still dictates aromatization
   Pinning 3x/week is better than 2x/week for stability, but total weekly androgen exposure is still the primary driver of estrogen production.

4. Estrogen isn’t the enemy, balance is the goal
   Estrogen is critical for libido, strength, mood, joint health, and cardiovascular function. The goal isn’t to crash it. The goal is to keep it in a healthy ratio relative to your androgen levels.

5. If an AI is needed, less is usually more, the goal is not to have to take it at all.
   Most people overshoot, and that is usually worse than having it a little higher than "normal". Micro-dosing something like 1/8-1/4 mg intermittently can make a meaningful adjustment without crashing estrogen. It’s a scalpel, not a hammer.

Before adding anything, I would dial in and stabilize your TRT first. This process takes 6–12 months for most guys, but it pays off long term.

Establish a stable TRT dose
Run that protocol consistently for 6–8 weeks
Get labs: total T, free T, SHBG, and sensitive estradiol
Adjust if needed
Repeat over several months

As you lose fat and gain lean mass, your hormone dynamics will change. What required intervention early on may not require intervention later.

Once you truly understand your baseline and response pattern, you can safely explore higher doses or additional compounds while knowing exactly how your body reacts. And you always have a stable TRT baseline to return to if/when things go sideways when you explore other compounds/doses.

Trying to manage estrogen while simultaneously changing dose, frequency, and adding new compounds makes it impossible to know what’s causing what. Every change takes 3-6 weeks to show up on labs and up to 8 weeks to fully stabilize.

Patience here saves a lot of problems later.

There are so many factors here. Do you see an endo? Do you have insurance? What were your levels prior to self prescribed trt? What is your height and weight?

HCG will cause aromatization. If you are already fertile, that is too much HCG. I am somewhat of a genetic phenomenon when it comes to anabolic but that is largely due to a pituitary issue that was found in highschool. My estrogen crashes bigly if I’m not careful. I do not get weird gyno sides like others generally do as well. The trade off is/was fertility… but we have a child and my wife had cancer so we scratched number two off the list after trying for two years as we don’t really know who is 100% the “issue”. However I felt like absolute garbage trying to maintain fertility.

Answer those questions and you can get further answers.

You haven't actually listed what your E2 was. If you don't have symptoms and feel good, you don't neccesarily need an AI. Some guys don't even need an AI on 500mg+ test.

Bear in mind the HCG is almost definitely contributing to higher E2. I'd work out how to properly manage E2 on just test first before you start adding other compounds.