Ratio Backspread Puts as an Insurance?

Basically instead of the 2:1 Ratio Backspread strategy, I'm doing 1:1 Ratio Backspread, one OTM Puts and one Deeper OTM Puts, same expiry, both on SPY.

Do I need to add another deep OTM Puts? As I'm trying to keep my bleeding to 3% maximum per year and buying another deeper OTM Puts would surpass that percentage.

I'm trying to use it as a tail hedge strategy incase the S&P500 crashes or even correct and sell gradually during high IV.

Puts are: 1x SPY $600 17 July 26 and 1x SPY 575 17 July 26, around 15% and 20% below current SPY, as those two Puts are Spy Monthlies have the highest liquidity for those expiry dates.