It took me 5 years to get out due to the stigma of teaching in the inner-city. I was at a school that was 99% low income. After growing the program to 400 students and earning the school's first-ever sweepstakes - it helped me get more interviews and finally out of there. But even then, it wasn't easy!
I would have stayed as I know I was making a difference in the kid's lives - but it was really having an impact on my mental health and I had to get out. The school was so poorly ran and the district used a pay-for-performance model that didn't work within the instrumental music setting. I was always rated to what equated to 'average' despite my accomplishments yet other teachers at my school who didn't even have degrees in education (alternate certification / career changers) were consistently rated higher than myself and thusly got paid more.
It can be done to get out. I, too, faced the same obstacles you did. Teaching in a title 1 district can certainly stain your resume - sometimes even with results. It's really sad and unjust. Hang in there and keep applying. It takes perseverance.