ESignature & Locking Existing Form Fields

Hi all, hoping someone can help. We are trying to streamline our maintenance contracts to customers, but running into some issues.

We have created an Acrobat form with several fillable fields (Customer name, address system information etc), however we have two issues:

1. Customer can also edit these form fields when they are sent a copy of the agreement

2. When sending for an ESignature, on the customer part when they click Start and Next, it scrolls through all the filled in fields, rather than just taking them to the signature and date field at the bottom of the document.

Any assistance would be greatly appreciated. 

Steve