does playing only low volatility slots make bonus review more likely

So I've noticed lately that if I stick to just the low volatility slots during wagering, my bonus seems to take forever and I start wondering if the casino pays closer attention to my play. I've heard some folks say you can get flagged for trying to "grind" the bonus out with these safe bets. It's tempting because I want to keep my balance steady and avoid busting out before clearing the wager, but I'm not sure if I'm risking a manual review or even bonus removal. Anyone else been in this spot and got any experiences to share?