.5 mg EOD of adex is serious overkill at 300mg test per week, and even overkill at 500mg-750mg test per week. You need to remember adex has a 3 day half-life...adex levels will build up too high, estrogen will plummet to low and you will gain very little.
.25mg EOD starting week 2 or 3, when the test actually begins to kick in would be better.
About the EQ, run it at a constant 500mg for 12 weeks...the frontload wont make much difference in the end, but neither will an extra week. Either way you prefer is fine...