You can make the switch to arom but in my experience, it isn't as strong as adex. 12.5mg would be a good place to start but there is a chance you will need more. I would personally need to dose my arom more often than adex to get it to work for me. If you need more, go to 12.5 ED instead of EOD. If still not enough, go to 25mg ED. Remember that the Ai is going to keep you from gaining water weight. Also, with enough Ai, you can do fine increasing the test to 400. EQ higher than test could cause erectile issues, so FYI if it starts to happen, you can correct it with more test.