Validator helper text position and style

[bradv123]

I have a custom text form field widget, and I created a custom form field dropdown widget using DropdownButtonFormField2. In the image the top is the custom form field showing where I would want to be able to put the helper text, and the bottom is the DropdownButtonFormField2 with it's helper text.

One thing I cant seems to do is move the helper text that shows up when the validator fails. Is there any way around this? My best solution right now is to add padding under the DropdownButtonFormField2 in my custom widget (which I really only want to do when there is an error message to show), and I have added 4 spaces the the start of my error messages which gets is close but not the same