Okay..............I get it.
Anything in the upper range should promote more growth than in the lower range. 800-1000 is high normal, so you will be able to acheive, and hold more muscle than someone in the lower range.
I do however find the range your falling in odd?? If your getting 400mg per week i would think you woul be in a higher range. The body on its own only produces like 49 mgs of test per week. So taking in 400mg per week should leave you well above normal? At least in my opinion.
How long have you been getting 400mg per week? I would say your levels should start to peak and even off at around week 4-5. Meaning if your consistent with your dosing, your levels will remain relatively the same week to week. And the results will start happening here.
But at 400mg i would say they should be way above normal. Maybe closer to the 2000?? I'm no expert though.