Exemestane or letrozole or both

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for my last contest i used letro (2.5mg ed) at the last few weeks of prep,and it managed my gyno well...after the contest i stopped using it for few weeks and my gyno seems to come back. now i take 2.5mg again but this time it's eod instead of ed.

could it be the rebound? i am thinking switching to aromasin so would like to ask you guys on this, or i can use half of each ( 12.5mg aromasin, 1.25mg letro ) or just choose one between the 2? which one would be better choice? thanks.