I've also been self-prescribing testosterone for years, dosage ranging from 200mg/week to 3,000mg/week. I find the sweet spot to be around 200mg-500mg/week. Anything higher makes me lethargic, at 3000mg/week I would sleep 15 hours and get almost nothing done, of course at 3000mg the physical results were dramatic. I could sit on my ass and eat a gallon of ice cream all day and still lose body fat. In my experience negative effects are most prominent when there is fluctuations of hormone levels, such as when changing the dosage dramatically. Of course it isn't a magic drug, the effects are slow and gradual. How it will affect programming productivity, I would say is subjective, but it will give you an overall better sense of well being.