To sum it up without rudeness: Madara is fast. Minato is far faster than Konan. Madara traded blows with Minato. The entire fight just is out of place with Konan and I see it as a necessary evil because Konan was such a good/awesome supporting character. Kishimoto could not have her go down like a punk b*tch.
But that's not how speed works in Naruto. Someone who's slower can keep up with someone faster if there isn't *that* much difference.
Minato is faster than Madara, Madara can keep up with the aid of phasing tricks and sharingan.
Madara is faster than Konan, but his attacks take enough time that she's able to keep up with volume attacks and sudden tag explosion.
Statwise, I'd say Minato's a 5 in speed, Madara's a 4.5, and Konan's a 4.
Also you've yet to show that Konan is all that slow. You're saying it's "Out of Place" but it's the only time we really get to see her fight for real. Konan was never demonstrated to be particularly slow at any point, so why are you so sure there's that much of a gap?
Torune and Fu were also able to keep up with Madara to an extent and they aren't the fastest ever (though definitely competently fast, probably 4s). They just lacked the jutsu to do much about it.
I feel her powers are overblown and Madara could have ended the fight as soon as she uttered a single word that confirmed Madara's suspicion that was was a taitor. As soon as that happened...Madara has both the speed and the technique to insta-win against her. She was already making eye contact...so why didn't he use the almighty genjutsu?
Madara probably doesn't have Tsukuyomi-like genjutsu. When he did a genjutsu, to find out what he needed, it was after she was stabbed (only possible when not in paper form) and exhausted, which'll lower anyone's genjutsu resistance. And the one he used seemed to take a few moments while he was holding her by the throat, not an instant one.
So he did it when he had an opportunity, and not before when he didn't. Tada.
In no other manga do I find so much CIS/PIS in the characters with so much apologetics occuring for it.
That's simply because it's not CIS/PIS here.
Now, if you talk about, say, Sasuke escaping via Manda, that's PIS.
But "Character who we haven't really seen fight is capable of keeping up with a pretty fast character," is not CIS/PIS, it's establishing a previously mostly unestablished parameter.