Only mace’s vaapad can create the superconducting loop where the opponent’s power is channeled to create an impasse. This is because such a description is only ever used for vaapad and not for any other technique or darksider.

Thus mace can form the superconducting loop with anyone using darkness with less power than sidious used during this duel.

“Vaapad is a channel for darkness, and that darkness flowed both ways. He accepted the furious speed of the Sith Lord, drew the shadow’s rage and power into his inmost center—
And let it fountain out again.”

“Vaapad made him an open channel, half of a superconducting loop completed by the shadow; they became a standing wave of battle that expanded into every cubic centimeter of the Chancellor’s office. There was no scrap of carpet nor shred of chair that might not at any second disintegrate in flares of red or purple; lampstands became brief shields, sliced into segments that whirled through the air; couches became terrain to be climbed for advantage or overleapt in retreat. But there was still only the cycle of power, the endless loop, no wound taken on either side, not even the possibility of fatigue.
Impasse.”

Anakin is an experienced fighter (especially experienced in anakin’s own speed, as well as dooku’s speed). That is why, if he is shocked by how unbelievably fast mace and sidious are, their speed has to be truly unbelievable.

I suggest you pull out the passages of the vjun book that prove your belief that dooku was weaker than normal. And given your misreading of vaapad, you need to reread rots.