Has anyone backtested Fibonacci retracement levels against different VIX regimes to determine whether they perform more reliably in low-volatility versus high-volatility environments?

Fibonacci retracement levels are a popular technical analysis tool derived from the Fibonacci sequence, with common ratios at 23.6 percent, 38.2 percent, 50 percent, 61.8 percent, and 78.6 percent. Traders draw these levels between a significant swing high and low to identify potential support and resistance during pullbacks. In theory, these ratios reflect natural market psychology and can signal areas where price may reverse or consolidate. However, their effectiveness varies significantly across market conditions, particularly when examined through the lens of volatility regimes. Backtests generally show that Fibonacci levels hold more reliably in low-volatility environments where trends are smoother and mean reversion is stronger. In high-volatility regimes, price action often overshoots or ignores these levels due to rapid momentum and wider swings. Russell Clark's SPX Mastery methodology recognizes this limitation and prioritizes data-driven tools over static technical patterns. At VixShield, we focus exclusively on 1DTE SPX Iron Condors placed after the 3:10 PM CST close, using the Expected Daily Range (EDR) indicator and RSAi for precise strike selection rather than relying on Fibonacci lines. The EDR blends short-term implied volatility from VIX9D with 20-day historical volatility to forecast the day's likely range and recommend conservative, balanced, or aggressive credit targets of approximately 0.70, 1.15, or 1.60 respectively. This approach has delivered roughly 90 percent win rates on the conservative tier across backtested periods. When volatility expands, as seen with the current VIX at 17.95, we shift toward the conservative tier and maintain our ALVH Adaptive Layered VIX Hedge. The ALVH deploys a 4/4/2 ratio of short, medium, and long-dated VIX calls to protect against spikes, cutting drawdowns by 35 to 40 percent at an annual cost of only 1 to 2 percent of account value. Our Temporal Theta Martingale recovery mechanism further enhances resilience by rolling threatened positions forward to capture vega expansion then rolling back on VWAP pullbacks, turning potential losses into theta-driven gains without adding capital. This set-and-forget framework avoids discretionary stop losses and emphasizes position sizing at no more than 10 percent of account balance per trade. All trading involves substantial risk of loss and is not suitable for all investors. For deeper insight into integrating volatility regime awareness with systematic income trading, explore the SPX Mastery book series and join the VixShield platform for daily signals, ALVH guidance, and live refinement sessions.