I'm not sure what you're asking?
~Your estrogen is high and that's why he gave you the script for Letro - if you take it be careful with the dose as very very little goes a long way. But if you drop to 200mg/week you probably/might not need it anyway.
~I'd see the Endo and get a legit script since, I'm assuming, you need it if you're not already on TRT. After that IDK, you could have your moments where you "blast and cruise". Unless you're huge I think you'd make better gains running a lower dose half the time and pushing it higher other times - and that would fit your doctor's wishes, probably your estrogen, and probably your goals of... Well I assume they're just to get a bit bigger and leaner?
~I'm on legit TRT and "supplement" on top of that at times. I'm 6'2" 220lbs at 8% most the time and don't need 400mg/week test to maintain, but I'm not huge, just bigger/leaner than average.
~Hope something helped being as I don't know what you're asking