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PIF is a great habit to have, but if you are gardening and don't plan on applying for anything soon, I wouldn't get so stressed if a balance gets posted. Keep using your cards for what you need (PIF like it's a debit card) and your payment history will show positive growth.
When you are ready to apply for something, that's when you might want to have your account optimized with the lowest utility and only one reporting a balance.