That is a low dose, in my opinion. I wouldn't use any less than 750mg a week (if enthanate is the only injectable). But again, you are keeping estrogen low and maybe not taking enough calories in.
Not too long ago, I used enthanate at 500mg/week for 5 weeks to test out the quality of the current supplier I have. And for me, that 5 weeks was pretty useless. I felt the effects of testosterone (night sweats, increased strength) but gains were minimal to none. So, I wouldn't freak out.