I have a side of a duplex a little further southwest of you (Westmoreland county) that I am currently looking for a qualified tenant. As far as your tenant qualifications I would consider upping the gross income requirements to 3x the monthly rent.
This is a bad time of year to try to find tenants. Many people move in the winter either because they have to (like being kicked out) or there is some underlying reason which they may not be divulging.
Consider running an incentive such as "Winter Special". Advertise such as if a tenant signs a lease by "such and such date" that you will give the first month rent for half off. I've had luck with that in the past and am currently running it on my vacant duplex.
I currently do not accept section 8. However I also get many inquiries asking if I do. After talking to some other landlords I am considering the section 8 route. Remember that just because someone has a section 8 voucher that doesn't exempt them from your screening standards. They still need to qualify just as any other tenant.
Good luck on your tenant search!