V4 idex z offset issue

Hello,

I need some advise. Im getting terrible z offset cal, between 0.17 and 0.175. I have checked everything and disassembled both heads, twice. Also swapped nozzle, because why not.

I havent done what ratrig suggested, to use a shim as a last resort. But as far as i understand, this is only important if i use copy/mirror mode correct? For dual filament its ok? I dont think ill ever use copy/mirror mode. Should i bother to make it close to 0 as possible? What are the downsides of using a shim as a spacer?
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