ListSource Strategy

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I know, another ListSource thread....  I searched, so if I missed it please just point me in the right direction.

I started building an absentee owner list for flips and rehabs using zip codes rather than the city in order to have more control on the numbers returned.  However, I have included almost all the zip codes in town and I'm only coming up with 200 leads.  My criteria is per http://buysellfixflip.com/using-listsource-com-bui... and is as follows: SFR / Last sale - 1900 to 2011 / BR 1 to 4 / max assessed value $1 to 227,000 (calculated per instructions) / Equity 30-100% / Excluded trusts.

What would you change to increase number of leads?  Or should I make another list targeting another group like late mortgages or something else?  I know 200 is not enough.  I don't want to get too far away geographically.