Rent to income ratio?

Have your guidelines for rent to income changed lately. We used to like to see 3 times rent monthly take home pay. But lately we are not seeing ANY traffic with those numbers. Has anyone had decent results with 2.5 to 1? We have some tenants (inherited) that are at aprox. 2-1 and make their payments. Or do we stick it out for a “better” applicant?

Don