SP500 and 20 Year Treasury Bonds

My trading strategy is based on the correlation between 20+year Treasury Bonds in downturns of the S&P500 to hedge against said market downturns. This strategy requires active rebalancing every quarter and assumes a complete sell of the treasury bonds near market bottom, as they historically increase in value during market downturns, to re-invest these gains into SPY shares before market recovery to acquire shares at a discount. During market recovery we are slowly re-adding the 20+ year treasury bonds over the course of market recovery and purchase further SPY shares along the way at discount prices until rebalancing has been achieved at a rate roughly in line with the market recovery cycle.