I am under water if I pay down in cash I can refinance. Is it wise to pay down in this market and get lower interest rate?

My husband and I were recently married, we are in the process of trying to refinance our home. We wanted to know the pros/cons of streamline refinance. We are also wanting to add me to house loan to see if added income helps with rate? I am getting the impression they (wells fargo) is wanting us to do regular refinance. They said it is a standard 3800 no matter where we go or what we do. Any others know anything about either?

I mean except you refinance a mortgage from 10%(to no avail of) to 3.0001, in the first 5 years(also unusual) and pay triple-principal for 18 months, then you’re ending up with interest sitting on the shoulders of interest right?

Does anyone know if the Catlin Refinance Institute is a scam as their email they sent me and their “website” don’t look very proficient. Also they are registered in Nigeria which immediately send alarm bells ringing.