Why does my 'r' sound so unnatural when I record myself?

I’m a pronunciation-obsessed learner and I record my Spanish practice daily to track my progress, but my trilled 'r' still sounds like I'm gargling. I’ve been analyzing clips of native speakers from Mexico to try and mimic the placement, but I feel like I'm missing the tongue mechanics. Does anyone have specific tongue-positioning exercises or feedback workflows? I’ve heard about tools like Chickytutor.com for real-time pronunciation correction, but I’m wondering if there’s a better low-tech way to bridge this gap.