500 mg sust a week, .25 ED is for sure too much for that test dose. It all depends on your body. If you start to feel like crap after taking your AI, your E2 is most likely tanking.
Hell, .25 EOD may be too much, or not enough, just look out for the high and low signs, like I said it all depends on your body.

As far as your test dose, just do it twice a week. The only reason people do it eod is to properly utilize the prop in it. Twice a week, the prop is not being dosed the way it should. Thats only 1 ester out of 4, the other 3 are fine for 2x week. You should only purchase sust if your gonna do it EOD, otherwise just get cyp or enth... but in your situation if its all you have then you dont HAVE to do it EOD. Hope this takes out some stress!