It's actually very simple.
The plates shouldn't touch the chain ring. It's the rollers that should engage tyhe sprocket, with the plate's sole function being to keep the rollers coming at 1/2" on center intervals. When all is good, there's be slop between the inside of the inner plates and the sprocket.
The allowance for clearance on a 3/32" chain has just shy of what's needed for a hard fit on an 1/8" sprocket, but as noted, that's not a fit. So, either buy a 3/32"sprocket, or a 1/8" chain.
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