Combining the best of different combat arts is lethal. Take mixed martial arts for instance. It takes the best from different combat forms, grappling, boxing and thai boxing.The Best Thai boxer is never a match for any of the top Mixed martial artists. Will he have better kicks and punches? Sure. That's what he's best at. But in an all out the mixed martial artist takes it every time.
MMA and generally unarmed combat is much more complecated, than sword fighting. It is true that boxer would loose to kick boxer and kick boxer would loose to grappling on the floor and similar examples. But sword fighting whatever style is essentially the same type of skill. It's like comparing two boxers trained under different school. it's all about swinging sword at different angle. Myself I trained in two Katana styles, different logic and moves but essentially it is all about swinging sword in random direction and countering attacks with blocks, redirections and counters.
Moreover, I went to watch Kendo session. Surprisingly I found that it is the same thing, the only difference is that in Kendo's logic is "Sacrifice your finger, arm or leg but finish of your opponent", while I was thought surviving aspect. In other words, if I am put against any other Katana wielder, it wouldn't make any difference, will win the one with better skill. There would be difficulties against musketeer as their sword is much lighter or spear as it is very different weapon but any Katana sword fighter with any style would have the same difficulties.
But his greatest mastery is of a form which is only designed for fencing. And that's what he uses while fencing. So Im not saying he would be useless against a Saber Staff or that he can't take a kick.But when he's up against someone who has mastered the deadliest form, and mastered the saber staff, and mastered close combat, those things will all give him an edge over Dooku's mastery of pure fencing form.
You approach it like form VII is better, than form II, which I can't agree with. Close combat is a separate art, it can be incorporated with any form, even if it is "pure fencing form". In other words any other Jedi would have difficulty against saber staff and kicks. In Yoda's case he is too small to kick or grab him but Windu would have exactly same difficulties against Maul but as you said he is powerhouse, so he is more likely to overcome it.
Just saying in pure Sabers and close combat I would give Maul the edge. His Combat skills are peerless and he's physically a beast.
I, also, give him the edge but not in a way that Dooku's specific style sucks against "deadliest form", saber staff and close combat.
As for speed. We have passages from the ROTS novel and Shatterpoint which confirms how fast Sidious and Mace are. Characters like Dooku and Maul (though very fast themselves) do not have the speed descriptions/feats of those 2 powerhouses.
It is still indirect comparison. Maul simultaneously defended against both Kenobi and Qui-Gon attacking from opposite sides. It is, also, a great speed feat and much more realistic, than beautiful description of one or another author. And Qui-Gon was Windu's equal at that time. Of course Windu got improved but to what extend? We can only assume how much faster he became since, maybe the difference is very small, maybe there is almost no difference.