Sorry for the delay, Master
my computer connection is damn slow now due to christmas nightime
From what I understand on the channeling chakra that is put to the weapon is weak, especially lightning, we can counter by using any Wind element jutsus. On the other hand, when we amplify lightning chakra through weapon and directly hit to the opponent the result would be either shocked or stunned.
Setting an example is the kunai channeling with lightning that is thrown to its enemy I think it can deflect by using wind jutsus.
other one, is lightning shuriken with strings that will wrap around the enemy. Hmmm.... I think the only thing that can negate is countering wind jutsus, too.
And as for nagashi well... if you're not a sharingan user your fast movement is like one-sided. I mean you vision is like a 'tunnel vission' and movement is one way- straight forward. You are in a disadv if your opponent can swing to left to right and counter it.