[Groesbeck Hurricane]

IMHO, your skill sets are the pertinent pieces of information. Break down your resume into skill sets. List former locations worked (as an independent contractor) on a seperate page. Have a second resume (the one you currently have worked up) to provide to people who want to see exactly where you applied/learned which skills. I have used a skill set resume for two decades with good success. Some companies do not want to see them and will throw them away. There will always be something in everyone's resume that causes a company to do a quick pass on you. It is inevitable with so many people looking for work and so many good options available.

Do you have a cover letter explaining why you are doing a career change at this time in your life?

Do not sound bitter! Be very polite and discuss the good parts of what you did and why you have come to your decision. Point out your ability to work with techinical details and ability to troubleshoot. Identify problems, plan the fix, execute, test, did you correctly identify the right problem? Just go through the basics. If the company is interested they will dig deeper.