You could also have a high tolerance for DHT, which is the metabolite of testosterone associated with hair loss.

In general though I think a lot of people focus very hard on the specific hormones, and typically they'll do what they say on the tin in standard doses. But there are a lot of edge cases. Higher or lower sensitivities, general proclivities, etc.

Before transitioning most people would've suspected I had very high T. I had a deep voice at a young age, built muscle fast, full beard as a teenager, the whole shebang minus baldness (but I transitioned young so that could just be time). But nope, my levels were average. I also responded fairly strongly to estrogen.

What's far more important than your numbers is if you're getting healthy and acceptable effects from your hormone levels. There's no need to mess with your levels unless there's need to mess with your levels.

Iirc, keeping or losing your hair as a guy has to do with DHT receptors in your hair follicles. T doesn't make your hair fall out, but DHT does, and your body produces more DHT as you get older (hence why finastride works as a hair loss inhibitor - it blocks DHT from the receptors in your hair). But only the hair on the top of your head is sensitive to this, with sensitivity higher in some places than others. Hence, some guys bald on the crown first, while some have a receding hairline first, and some never bald at all.