The only time I had to cut back my dose was after my hysto, and I was glad for it. After the hysto, my T got so high that it was converting to estrogen at a pretty high level. I was fatigued all the time. Couldn't get enough sleep, never wanted to get up. After it was lowered, it was an almost instant fix.
Obviously my concerns being post-hysto were a little different than yours. There are non-hormonal birth control shots you can take that will keep shark week from returning. I would tell your doctor if she insists on dropping your dose, that you would like to start those shots at the same time.
I'm really curious about why your initial dose was almost double what most people are at. I would imagine that is likely what contributed to the situation you're in now. Was it a necessary move based on how your body was responding to the T based on lab work? Have you been getting E tested along with T?
With the decrease in dose, at least initially what you will experience is likely going to be very similar to what you experienced when you first started T - some temperature fluctuations, fatigue, etc. This should only last for a little while as your body acclimates to the lower T levels.
As long as you are getting T, you shouldn't back slide. My only worry for you would be shark week or spotting, so I would ask about Depo Provera when you go in next. I would also (if you can afford it or you have insurance that will cover it) see if you can be a little more frequent about getting labs done to see how the changes are affecting your T and E levels as well as the hemoglobin. I'd also start giving blood to see if you can positively affect it that way.