Doug,

I'm with everyone else I don't think your wanted emails will be marked as spam if you turn off your rules. I use Gmail for my personal account. Definitely for the first few days and maybe a week or two it had a number of false positives but now they are few and far between and false negatives are very rare too.

I really don't think you can expect absolute 100% spam detection performance via Google or your rules or anything short of a human. But I would say Google heuristics probably beats yours.

If anything make sure your wanted emails are not marked as spam via rules rather than the other way around.