Sounds like you should really try and get these pressed in. I'd probably try to avoid the washer trick if you're having spinning issues. The washer trick is 'spinning' it into the hub vs a press which would go straight in. If you have the hub off, pressing wheel studs into a hub takes no time at all.
As long as you don't think your hub is messed up already, I wouldn't bother replacing it. Also, I would not recommend trying to drill larger holes and save that option for dead last.
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97 240sx se
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