I think that most of you are overrating the Force as a factor during duels. I would even risk an opinion, that Dooku was never able to effortlessly choke / push Kenobi. Before any of Dooku Force attacks, his opponents are overhelmed and thrown off-balance in saber fight:
https://www.youtube.com/watch?v=VCoG7UsHG8Q
1:28 - Dooku overhelms them in saber lock, Kenobi is clearly thrown off-balance and has his guard left. Dooku then Force chokes him
https://www.youtube.com/watch?v=RIe2A-SnXlY
This time it isn't as clear, but it's one of Dooku's advantages of one-handed grip - he blocked Kenobi in saberlock, and used his left hand to push Kenobi when he was vulnerable.
Dooku disarms Bulq right before a Force attack.
On the other hand, he was never able to stomp Kenobi the way he stomped Tiplee. Possibly because Kenobi was far superior to her as Force user.
Dooku couln't Force push Kenobi as well, when Kenobi was ready for that, as we could see in their last enoucnter in TCW.
Even Anakin was unable to overpower Kenobi in their push's fight. Imo mostly because Kenobi was ready for that attack.
Opress had to overhelm Adi in a saber fight as well. Then, he could use the Force.
Dooku had to engade Asajj and other NS in saber fight, until he catched them off-guard to Force attack. They probably left their guard after he seemed to be defeated.
Ventress also got terribly overhelmed by Dooku in their last fight in TCW, which enabled him to stomp her with his TK
Kenobi was two times floored by Maul's TK, mostly because he had to split his attention between Maul and Savage.
Even Vader - considered as a beast in the Force - couldn't easily Force pushed Ahoska. At first he needed to overhelm her in saber fight. And Ahsoka pushed him only when she evade his strike at first, and countered immediately, before he could rise his guard again.
We could also see a duel between Ahsoka and Maul with none of them having an advantage. The same Maul was badly stomped by Sidious. Ventress was badly stomped by Yoda.
Ahsoka, Ventress, Kenobi, Maul or Bulq - hard to tell, which one of them was the best Force user, or which one of them had the strongest guard. One thing is obvious for me: neither Dooku, Vader or Mace could easily stomp those guys in the Force. Unlike Sidious or Yoda. So Vader might be > Dooku or Mace or Anakin in the Force, but that dose not change the fact, that he's closer to them, then he's to Sidious. He has to fight people of Kanan's or Ezra's caliber, to stomp them in the Force. Nothing suggest, that he will be able to stomp stronger rivals.
And on that level of skill in the Force and sabers (Dooku, Mace, Vader league) sabers ale obviously more usefull as a weapon. Unlike in higher league - league of Yoda and Sidious.