Serum estradiol tests are not implemented widely by AAS users n order to adjust anastrozole levels. Most simply judge it based upon level of water retention, sensitivity of nipples, and extent to which joint aches are tolerable/noticeable. While estrogen-based tests may be better and certainly more acurate, many do not feel these are needed or worth the time/expense.
Also, being that most recognize Test Enan to have a half life of 4 days, administration of twice a week is common among AAS users (though many endocrinologists use once a week administration).
In terms of Pantoprazole, I do not believe it is contraindicated with anastrozole, but a doctor or pharmacist (who is also bound to confidentiality) could answer this question. If it is not, the anastrozole administration could happen every other morning, evening, etc.