I would say about 1mg of adex per week. .25mg EOD is standard.
Keep the hcg the same whether it is blast or cruise. 500iu E3d is a lot in my opinion. I have had great results with 250iu E3d... but if this is what your doctor prescribes then follow his guidance.
There are numerous ways to blast/cruise. I know some guys who just always keep the test at a maintenance dose and then add 4 weeks of orals, then 4 weeks off, and repeat. Other guys do the same with prop, ect....
Others will blast for 8-12 weeks with long esters.
Personally I plan it around my meets. about 10 weeks out from big meets I bump my test up, sometimes add another injectable compound (tren, EQ, ect) and/or an oral for the last 4-6 weeks. Then I go down to 250mg test/week again until 10 weeks out from my next meet.