And find another doctor as he has no clue about the half life of cypionate. Ten days is far to much of a spread between shots. Look at this basic testosterone metabolism chart and you'll understand:
So you're gettina a large spike ot test and E2 upon injection then a slow ride to nothing. If you self inject I'd recommend switching to 50mgs every 3.5 days which will give you steadier levels consistently as well as less of a spike in E2. And yes, 50 mgs not 75. You can get by with less with a 2X per week protocol and still maintain equal or better values. Plus you get to bank a little Test as well.