Acrobat Reader mobile apps for iOS and Android do not support editing of forms properties.
To standardize text size, please specify a font size (other than 'Auto') for each text field using a PDF Editor app, such as Acrobat Pro for Windows or Mac (desktop app).
Font size changes need to be applied to your original PDF form.
Hope this helps.
Please let us know if you have additional questions.
Thats what I had done for each text field, but when opened on the iPad it seems to be defaulting back to Auto.
Would you be willing to share your PDF form with us (Adobe) so that we can investigate the cause of the problem?
I've sent you a forum private message with the instructions on how to share your file with us.
Thank you for your help.