Sub Q injections are just as effective. I've proven this at least with myself through bloodwork. 100 mg/test cyp injected sub-q gets my TT up to nearly 1000.
I think your AI dose is probably fine. It may be too high or too low and it's extremely hard to determine high or low e2 without bloodwork since both will make you feel horrible.
Emotionally, both high and low make me feel depressed and off. When it's high I feel emotional and want to cry. When it's low, I feel more flat lined emotionally.
Estrogen also works synergistically with our vasodilation mechanisms and when it gets low, you'll notice your vascularity decrease/veins wont look as prominent.
You may also want to start taking a vit d3 supplement. I typically take 5000 iu's year round personally.
"A high level of homocysteine in the blood (hyperhomocysteinemia) makes a person more prone to endothelial cell injury, which leads to inflammation in the blood vessels".
Because controlling inflammation is key for longevity and health, I'd also suggest taking Curcumin daily. Biotest has a great brand that I like. It also looks like low b-vitamin levels are associated with high levels of homocysteine.
"Homocysteine also acts as an allosteric antagonist at Dopamine D2 receptors." Which unless I'm mistaken, means that homocysteine will block dopamine at receptor sites, which can also lead to lethargy, lack of motivation and libido, since dopamine is key from that perspective.