I think those dosages are fine, but thats just based upon what previous recommendations I have read from more experienced people around here. The only concern I have is in regards to the duration. Everyone says that you really should push EQ out around 15 weeks if not more. Im have my current cycle planned to be about 25 weeks to tell you the truth.
Most people recommend 600EQ, so I would think that 500 would get you some decent results as well. If you want to try 400, i suggest giving it a run and see where you stand around week 8-9, but really with you doing 12 weeks total, theres not much time to tweak your dosages to get the desired affects you might be looking for during the remainder of your cycle.
Its just hard to say how one person will respond to X amount of X compound when everyones body respond differently. Couple that with the fact that I am not an experienced EQ user, and I cant give you any real solid advice. Hopefully someone with more experience will chime in and point you in a better direction.