they are indeed not mutually exclusive, but keep in mind that an early void limits a will just as well as a scrying
I think you've lost me here. I said Will needs to stay in because it's the best card ever. You responded that the reason you've considered cutting Will for Scryings is that they both get equally hosed by an early void. I detect a slight discontinuity in the discussion there.
After a Nether Void has hit, you should have effectively won. That's what a finisher does. If you're dropping it early off ritual for the sake of "I'm a Void deck so I should play it" you're going to lose. Unless you've got a clock on the table fast enough to kill them before they ramp up sufficient mana you're going to get hosed. Tinker is a 3 mana spell that makes you lose the game. Period. If you can't kill them before it gets on line you're boned.
The reason to run Will and Scrying is to get to the point to where you can drop Void for the win. Will lets you replay all your threats and wreck your opponent's hand. Scrying lets you dig into more threats and disruption. Both are pretty poor once Void is in play, but that's because it's not their purpose. Dark Ritual is a completely dead draw once Void hits as well, but I don't suggest cutting those either.
I think this discussion has about reached it's end without seeing your actual list. It's impossible for people to tell you what to cut when we don't know what you're running. From your opening post your could be running 35 lands for all we know. Because of this, all we can respond with is theory, such as Will is a good card so run it.
In reality though, this is all beside the point. Nether Void is a terrible deck in the current format. Stax eats it alive as Mishra's Workshop lets it practically ignore Void, and CS just need to resolve a spell that costs a single
to win. Gifts obviously has trouble with Void, but if you manage to make it hit, you've already won anyway.
