How Can I Increase Checkbox Size for Signing Field?

Hello,

I am using 

signatureBuilder = signatureBuilder.WithField(FieldBuilder.RadioButton("Group3")
.WithName(fieldName)
.WithValidation(FieldValidatorBuilder.Basic().Required())
.WithPositionExtracted());

To create required radio buttons on a signing document.

Recently, I had to change the signing document(template) to use smaller fonts and the problem begun.

As shown in the screenshots, while signing, the radiobtn (or checkbox) became very small, so it is harder to click now.

Also, after signing is completed, the "x" mark on the radiobtn (or checkbox) also became very small.

I have tried to use .WithSize() option but looks like this does not work with .WithPositionExtracted()

In this case, is  there any way to increase the radiobtn(or checkbox) size along with the "x" mark without making changes to the signing template I have?