E levels fluctuate quite a bit on injections so there is really no use in measuring them, they will be over the place. Ask your doctor why he aims for 200 pg/ml and what this decision is based on. Higher levels in men with prostate cancer of a certain age and in pregnant women have not shown to significantly increase health risks, I can provide these studies and statistics to you, if you so wish. I'm post-op since 2005, my E levels are around 1,000-4,000 pg/ml. My health is fine and I'm supervised by three doctors. Injecting every 2 weeks can cause too wide fluctuations in levels leading to menopausal symptoms in some in the last few days but if you feel fine, then alright. I inject every 5 days.
Lastly, shouldn't feminization and well-being be more important than levels? Obviously the return of BO is not a good sign and this goes to show you that reliance on levels alone is not in your best interest. If instead the focus was your health, psychological well-being and overall feminization, I think things like this would not happen. Just my 2 cents, I'm not a doctor but worth discussing these matters with your doctor, I think.