One easy example being my drawings showing where the oven hood exhaust vent would come in the soffit at the roof and instead they just ran it straight out of the wall.

My advice in general is to exhaust your 10 conventional loans before moving on non-QM/DSCR loans if you can qualify. 

Once you have exhausted your current income and your cash flow is adequate to support your lifestyle; at that point, you can consider leaving your job. 

I call tech back out and after 45 minutes of testing we found out the tenant moved garbage cans to the side of house and blocked the PVC exhaust pipes, which could have caused a carbon dioxide build up!

The owner had moved off island and the realtors were exhausted.

It isn't exhaustive, but it gives you some kind of idea.

I've exhausted contacting all the common resources for gap funding.

What strategies would you suggest a start with to find solid leads when I have exhausted my circle of 600?

Have you exhausted the option of using your wife's income?

The only time you quit your day job is when you sit down Sunday evening and say your exhausted.