The delta pairing I use on a hedging put spread
When building a put spread for protection, I pick it in delta space rather than strikes.
Buy around a 30 to 40 delta put. Sell near 15 delta to cheapen it.
Protection where a drawdown starts, financed by a strike far enough out to be worth selling.
These are just guideline to get you started, then you adjust strikes to fit your risk/reward and views.