My FSH was 450units which I understand is the highest. For me also higher dosage didn't produce any extra eggs.
I haven't heard that stopping DHEA suddenly is detrimental. I had seen many Fertility Specialist and only 1 told me to stop DHEA during stims. I ignored this until the last 2 treatments, after I found out that DHEA contains testosterone which can damage egg quality during stims.
The last 2 cycles produced the best results by far, in terms of quantity and quality of embryos. So not sure if E2 priming or stopping DHEA was the cause for the quality, but maybe a combination of both. I'm convinced that E2 priming was the key to the quantity though.
After 10+ cycles hoping to see at least 3 follicles on the scan, and sometimes only finding 2, I literally burst into tears when I saw 7-9 after starting on E2. I had never seen that many big black balloons on my scan before!
Yes E2 only for 7 days from day 21 to start of period.
Not sure what your FS means about lining? My lining was always good, but from what I read, E2 priming tricks the body into suppressing early release of FSH without down regulating. The problem with down regulating low responders is that it switches off the normal production of hormones which can then be sluggish to restart. Early production of FSH during luteal stage is what E2 seeks to prevent so that a dominate follicle is not 'preselected' prior to stim injections.
I can only speak from experience, but I would recommend you try E2 if you can and stop DHEA from day 1 to day 15. If you have naturally high FSH at Day 1 then E2 will help reduce this and hopefully give you more and better quality eggs.
I would be interested in hearing how it goes.