I used femera, 2.5mg ed for my last cycle(10 weeks) as well as for about 4 weeks post cycle and I had no problems at all. Estrogen will return of course which is normal so if thats what you mean by rebound, yes it will happen. If you are stating people claim estrogen comes back higher, I dont buy it. I have only seen a couple people post blood work numbers post cycle and had raised estrogen. This is not necessarily a sign of rebound but simply "still" elevated estrogen levels from the cycle they were just on. Even aromasin will not get rid of 100% estrogen and then if your on a cycle taking in 8-10 times the normal amount of test, even with significant estrogen reduction due to letrozole its still very possible to hhave higher than normal estrogen levels.
Im not into splitting pills or anything so I just took one daily. For 800mg/wk you can likely get by with 1 tab EOD. I was on 40mg dbol ED, 800mg EQ weekly, 750mg test enth weekly and 75mg tren ed.