One of the biggest gripes I hear from procurers is that people making submissions often fail to tell them exactly HOW they propose to tackle the job. Yes, you've rabbited on about your experience but that's not enough to inspire confidence.
Make sure you show that you know how to put a project plan together. What unique systems and/or processes do you bring to the table? What will you put in place to ensure you finish the job on time and on budget? Have you a Communication plan in place that shows me how easy it will be to deal with you?
When people see the word "methodology" in an RFT they start to panic - but really it's just a big word for TELL ME HOW!