The problem is you're asking the flight schools. Many, many instructors are not associated with flight schools as they work completely independently. Well over 90% of my dual given is not at a flight school, and has been in owners' aircraft.
The suggestion above about looking on a bulletin board is good, but don't just limit yourself to that. For example, when I was CFI-ing regularly, I didn't do any advertising at all after the first year - at that point, I had built up enough word-of-mouth business that it was self-sustaining.
So, where do you find CFII's? Talk to the other pilots you know. You have a CFI you've worked with in your plane, right? Ask if he/she knows anyone they'd recommend. Get on local message boards and social media. I'm not sure where you're located (KSDX is not a valid airport code. Typo?) but there may be a local Facebook group or something (like in my area there is "Central Oklahoma Aviators" and for the Dallas area there is "North Texas Aviators"). There are ALWAYS posts on there from people looking for instructors, and then getting recommendations.