The built-in validation is either switched on or off, or off when a validator for the entity is present.
So there is no finer selection of the fields to be validated.
What you can do is, use the 3rd option BypassWhenValidatorPresent.
By adding the following to the application config file:
<add key="scaleOverflowCorrectionActionToUse" value="2"/>
Then you should use a validator for the entity which have these special fields.
Inside the validator you should perform the basic (should have been) built-in validation on the rest of the fields.
This way built-in validation will be triggered for entities which have no validator assigned, and in this specific entity, no built-in validation is triggered, but you workaround this by validation the fields yourself (i.e. in the validator class).