Assuming, key word, that your dad is as pigheaded as all old people - and I'm on my way - then guiding his "TRT" to safer waters is prudent.
125 per week should bring him below the 1K mark. That's pretty much my exact baseline TRT dose btw, and I test right under 1K at that.
That will also radically drop his aromatization, so he might not need any AI after 3 weeks on the new dose. He could skip a week just to get corrected faster.
I just got off the phone with him and told him the results. He says he is willing to drop the dose to 125mg/week for the next couple months and recheck bloodwork. He doesnt want to take the AI at this time. My Dad is pretty conservative when it comes to taking drugs and doesnt want to take too much stuff at once.
I dont think there is anything wrong with lowering the dose to 125mg/week. My only concern was that the estradiol may not drop as fast as his testosterone which will throw off the ratio and he may experience side effects from high estrogen.