I wouldn't spend any more than I was planning on just because my portfolio increased.
I would spend more if that's what I wanted to do, and was part of my plan.
For example, I am ramping up spending after FIRE, and anticipate a FIRE budget of approximately double my pre-FIRE budget (due to switching to full time, around the world travel, and due to having a kid). But our optimum spend level is determined by our wants and needs, and we'll spend that, regardless of our portfolio.
If that means our WR drops as our portfolio grows, great. If it means we need to earn some more money, okay.
But our spending and our portfolio size are COMPLETELY decoupled.