RE: Estrogen rebound help...
Estrogen rebound generally occurs when LH levels are quite high, as this tends to upregulate aromatase enzyme
To reduce chances of this then yes you could taper off your anti-e's as you said mate
Letrozole comes as tabs which are 2.5mg each, or some UG labs produce a solution which is 2.5mg per ml. It has a half life of about two days. So you can taper off by going from every day dosing, to every other day, to every three days, and so on