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Can the advance go negative? On my FR-S it did. I found best fuel economy at -20 degrees, while stock was -10 or so.
I think unfortunately EGR control is a little harder than what you described, most importantly you need to prevent overdilution at low load where there's a lot of intake vacuum that would draw a lot of exhaust in. It should be completely off at idle, then ramping up to max EGR fraction, then decreased back to 0 at high load.
Easiest is to just have it open to a preset position in your cruising rpm range and shut everywhere else. That way it doesn't work against you most of the time.
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