I have never done this with my T.

But I am familiar with the technique. We practiced it in school so we can learn how it would feel to be the client talking to an empty chair.

I express my anger with my T still in the chair.

It can be a very powerful release. I encourage you to go with it! (If you feel comfortable, of course). It's totally natural for it to feel weird... that is okay... but it might be very helpful. Looks like you had great results so far.