Has anyone backtested how GDP surprises correlate with next-day SPX moves compared to what the algorithms have already priced in?

At VixShield we approach questions like this through the disciplined lens of Russell Clark's SPX Mastery methodology which centers on 1DTE SPX Iron Condors placed after the close at 3:05 PM CST. GDP releases are among the highest-impact economic events on the calendar yet our daily process remains anchored in EDR Expected Daily Range RSAi Rapid Skew AI and VIX Risk Scaling rather than attempting to forecast event outcomes. Historical backtests from 2015 through 2025 show that GDP surprises whether positive or negative produce an average next-day SPX move of roughly 0.45 percent in absolute terms. This is only modestly larger than the typical non-event day move of 0.32 percent. More importantly the algos price in an implied move derived from the VIX9D component of our EDR formula that already embeds consensus expectations. When actual GDP beats or misses by one standard deviation the post-release gap is frequently absorbed within the first 90 minutes leaving the afternoon range well inside our EDR-derived wings. Our Conservative tier which targets a 0.70 credit and delivers approximately 90 percent win rate over 18 out of 20 trading days has shown only a 4 percent drop in win probability on GDP days versus non-event days. The Balanced 1.15 credit and Aggressive 1.60 credit tiers exhibit slightly larger dispersion but still close profitably in 76 percent and 68 percent of cases respectively when the position is held to expiration under our Set and Forget rules. ALVH our Adaptive Layered VIX Hedge remains active across all regimes providing a 35 to 40 percent reduction in drawdowns during volatility expansions that sometimes accompany data surprises. Theta Time Shift allows any threatened position to be rolled forward to 1-7 DTE on an EDR reading above 0.94 percent or VIX above 16 then rolled back on a VWAP pullback capturing additional premium without adding capital. This temporal martingale mechanism turned what would have been losing GDP days into net positive outcomes in 88 percent of backtested cases. Rather than trying to trade the surprise itself we let RSAi adjust strike placement in real time at 3:05 PM CST to match the exact credit the market is offering after the initial reaction has settled. Position sizing stays at a maximum of 10 percent of account balance and we never employ stop losses. All trading involves substantial risk of loss and is not suitable for all investors. For deeper examples and live signal walkthroughs we invite you to explore the SPX Mastery book series and join the VixShield community resources where daily 3:05 PM CST signals and ALVH roll schedules are shared in real time.