I don't think that the added DHEA would "do nothing" just because you're young. By that logic why wouldn't the pregnenalone also do nothing if you're not deficient?
Haidut's recommendation is not to exceed 15mg DHEA per day in 3 divided doses, and to take steroids with niacinamide to increase NAD+/NADH.
He has also posted that 2-3 mg of androsterone limited aromatase activity by 90%.
So, taking something in the range of 10-15mg pansterone + 1-2 mg androsterone per day as a male should be ideal if you want the maximum effect.