I don't know how you treat author statements but Jeremy Barlow stated that Talzin was equal to Sidious, I personally think author statements are trash and have no reason to be used at all, but you do you.
Talzin believed
Dooku's energy would restore her body and give her greater power than she had as a living person. When she fought Mace, she was a much weaker spirit. I believe her existence was pretty unstable too.
During the same confrontation, Sidious stalemated Talzin. To break the stalemate, Maul decided to join in, transferring his power to his mamma. Dooku answered the call to battle and combined his lightning with Sidious's, tipping the balance of the fight in Sidious's favor. If the confrontation was a stalemate and Dooku ended up being the deciding factor even after Maul joined in, this can easily increase the Count's hype.
Dooku after Talzin returned to the physical realm <<< Dooku after Talzin started the draining process <<< Dooku
Dooku had all of his energy drained and only a small time to recover, but even a small portion of his power proved to be useful than Maul's full power. Ok, Maul is not the goodest next to Sidious, but I honestly think this can bump up Dooku's standing. I think the Force choking argument shouldn't be used because Dooku wouldn't dare put up resistance against Sidious. I don't know much about the tiering system or your methodology so I'm not about to try to lecture a staff member on something I don't understand.