My suggestion would be try to put spades all around if possible. Bare wire oxidizes and will fatigue from being clamped on.
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I'd do my best to fit the cable straight into the binding posts if possible; the less connections the better.
It's true copper oxidises, but this happens slowly on the exposed copper (not the bit clamped inside the post), and it's nothing that can't be fixed by trimming an inch off once a year.
I noticed what to me sounded like more open upper frequencies (especially in some vocals) when I eliminated the banana plugs and went to bare cable a while back.
You might want to re-think using 4 10-guage cables. Lots of copper for the low in a bi-wire is often great, and is recommended most of the time, but it can be bad for the mid/high. There is a reason most pros and cable companies in bi-wire rigs use smaller guage. Hard to maintain precision, speed, etc in a larger cable.
Spades are great, but do consider that Nordost chooses z-plug banana for a reason (Vahalla, etc). I like Cardas rhodium spades after z-plug. Skip WBT offerings...too expensive and too colored for me.
It has been too long since I bought any. Part Connexion has a lot of good stuff like Cardas connectors (which are quite good...trust them, despite not being a big fan of their cables).
It is harder to find good z-plugs. Analysis Plus cables like Oval 9 use z-bananas and sound good.....maybe A+ sells them? Hard to go wrong with all copper connectors spade or banana....be careful when buying because a lot are BRASS coated with copper and/or gold and not as good. Cardas coats copper with rhodium to prevent oxidation.