10agw +10agw=7agw? need some big Banana's

just put new banana terminals on my 10 year old Acoustic Zen Santori shotguns. went with Audiquest 500 series connectors for the speaker/bi-wired ends. the problem is they won't fit/work on the amp side where the wires are doubled up. pretty beefy wires at 10agw per shotgun/bi-wire. looks like i'll be needing banana plugs that can accommodate 7agw? (10agw+10agw?)

my local shop who installed the Audioquest 500's on the speaker/bi-wire side doesn't offer anything that will work for the doubled up amp side. been looking online and see very few option for something this size.

two questions.....

1) can anyone confirm my math for the required size needed?? 10agw+10agw=7agw?

2) then possibly point me in the right direction to find some high quality banana's that will fit/work?

(not looking for replacement spades. just interested in banana terminals)

thank you!