I had the same issues, I ran an AI on cycle and came off PCT, I got bloods done the first day and had low estro, but I continued on the low dose AI just throughout, keep Estro where I wanted.
Others usually introduce the AI somewhere like Week 2/3 at like 1-2 caps a day so for Erase something like 1-2/3/3/2/2/1
So example with a SERM
as you taper the SERM you bounce the AI up.
Torem
90/60/60/30
AI
0/1/2/3/3/2/1