bathroom faucet leak at base plate and mounting nut

Replaced new faucets in bathroom to find No leaks at coupling nuts but wet at (rubber) black base plate and some drips at plastic mounting nuts under sink, any installation tip or should just replace for more expensive ones. my purchase about 39.95 each. thanks for any help.
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1/8" of plumbers putty onto the sink from the holes to the edge of the rubber plate before you put down the rubber plate.
you may need to replace the old lower compression nut's bushing and the vertical supply tubes if tightening nut does not stop drip. take along old parts to hardware store. you may need to check top and tighten its parts if it is seeping out a stem.
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