My head hurts reading all this illegal nonsense. Go read up on fair housing rules before you get sued. You literally have a public post telling a judge how you want to discriminate. It’s a slam dunk case. You’re basically saying you want a middle age white married Christian couple with 1 kid and a cute little dog.
You need to nail down your criteria and then process applications in the order received. If they meet your criteria, offer them the place. You just need to be consistent. With fair housing violations, the burden of proof is pretty minimal for you to get fined. Asking for a letter about them is a horrible idea. Just gives them another thing to use against you if they’re not selected.
You're in class D ghetto hoods. You'll be luck to keep it at the HUD guidelines of 2+1. Those are exactly the type of tenants going after someone like you for a quick buck. And in this case, they deserve to win.
In the hood, 4 times rent is plenty good. I’d also eliminate anyone with evictions within 5 years and felonies within 8 with the exception of sex crimes which are lifetime ban. You can pick a credit score minimum but it’s the hood and the 750s are never happening. You’re gonna get someone in the 500s with medical charge offs of $200 and Victoria secret charge offs of $480 and old utility company charge offs, some phone bill charge offs and half a dozen student loans in deferment for a degree never finished. Probably a car repo too. As long as they have sufficient income and no debt for past landlords, you’re good. That shows they care about paying the landlord but screw everyone else.
Btw- I’d stick with your property manager as he seems to know what he’s taking about.