Well, I am surprised to hear this from you. I don’t think it’s common practice in equities to reduce leverage on existing positions. How are you going to model that into your portfolio? This is one of the reasons I don’t like trading futures - they allow you to leverage up and then pull the rug under you at the worst moment.
My book holds equities and options in a portfolio margin account. Since margin maintenance is aggregated, I simply sell down assets that require a high margin relative to upside (as simple as that really).
Not sure about commodities or futures neither.