It's an interesting question.

I've been experimenting with a strategy over the last year where I went on an application spree with P1, but continued doing a steady 1 application every 6 months for P2.

P1 took a big hit, and now I can't get approved for anything (recently rejected for Venture X and AOD), whereas P2 has near perfect credit, and gets approved for everything she applies for.

P1 is now on gardening leave until the middle of next year, and at that time I'm planning to go back to my preferred strategy of 1 personal application every 6 months for P1 and P2, with some business applications mixed in there too.

I'd be interested to hear other peoples strategies to see if my model can be improved on.