I always trim down my wheels to fit slim staggers and you are right this covers the vent hole however as I don't glue yellow or green staggers I don't make any extra holes in the wheel or tyre as I can pull the bead back to get the flat spot out the tyre if needed
I only put a hole in the tyre if I run the silver compound as you must glue them to the rim and you can get the tyre imploding inwards without the hole to allow air in
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