Lots of men take doses like that for years. My best friend was on Tren for 9 straight months, his test dose is always over 400 and its been like that for a decade. The amount of test you can "safely" take is person specific. Keep in mind, the blood work we do only tells us if something's is fucked. Something has to already be an issue to show up. Its like looking for smoke as your fire protection. it works, but its kind of wreck less.
There have been actual medical studies done by bonified doctors, published and peer reviewed where they gave regular people, ladys some of them, over 100mg of anadrol a day for like 6 months. google it, it gets linked all over the place, there are a bunch of them.
There is a steroid doctor on the RX muscle YouTube channel that takes questions from people and answers them. Watch all his videos, they are only about 20 min each and perfect for a cardio session. He gives his real medical opinion. in one of his videos he talks about some men safely taking over 600 a week. HE does not recommend behaviour like that but he gives an actial medical opinion. IF I recall correctly, with hormones is not so much about the dose, its the duration.
750mg a week isn't horrible IF you are not getting a side effect that can take you out.
IF you lipids are ok, and your liver is doing ok, and your BP is not wackadoo AND your blood thickness isn't creeping up, AND you are not getting cystic acne.
then you can make the ASSUMPTION (within reason and to the best of your knowledge) that you are ok crusing at 750mg a week.
Me personally, on anything over 400mg / week for an extended time, my blood pressure goes up, and after about 6 months my blood thickness starts to raise past the reference range. I get some sides, its not a safe level for me. An ace inhibitor and regular blood donation gets past the sides but the sides are there, my body is pissed and doesn't like that mg/week number.
Sounds like your body is ok with it (750).
I say keep running bloods and stay at that number if you feel ok, and can afford it, and don't want kids.
I am a confirmed moron though, take my advice with a shot of parabolin.
https://imgur.com/1XD0i1m