Earl grey macarons

I made some Earl grey macarons a couple weeks back. I used a packet of Earl grey tea bag for the shells, and two packets to soak the cream when making the ganache. Yet, the earl grey flavour wasn't obvious. At all!

Earl grey macarons

Can anyone shed some light to why the earl grey flavour wasn't present at all? The macarons tasted really plain - like it was just almond shells with plain chocolate ganache! :/ Perhaps the brand of earl grey tea used? I used Twinings. Perhaps I should have used another brand of earl grey tea leaves.... Hmmm.