The entire point is your e2 is 300% higher than the maximum range and needs to brought down asap with an AI, not just dealt with using more or less or different steroids. This is entirely what AI's are for otherwise we'd see our bloods and our e2 being 300% higher than max range and never have thought "I should have used an AI on cycle" or "I better get arimidex on board ASAP" or "Next time I'll be adding 12.5 aromasin e2d and instead you're asking if we should default to "I better lower my dose and let me e2 come down"? This is the least effective way to get your e2 in check when it is as high as yours and for what reason, because you're hesitant to take aromasin?
If you want to protocol it that way that's your prerogative dude but when the gyno, cardiovascular issues, and erectile dysfunction all hit hard you'll know why.
In what capacity then would you ever use an AI? You started with 3/4 of a gram of androgens with no AI, then got bloodwork, had your e2 through the roof and still do. At what point would you ever use an AI then?
Again, had I seen your cycle from the start with more updates I would have said immediately to run aromasin with that cycle. See bloodwork for the reason why. And the long answer to your question "Why not adjust what you're currently taking before adding in aromasin?", is that when you don't have bloodwork until the end of your cycle and are running blind it's a no-brainer to run an AI with 750mg of androgens on board every week. The short answer is "science".