Frame it as a favor to them and sometimes they'll take you up on it and move early if it's convenient for them.

In my experience, after doing some favors for agents in my office, they threw me referrals for smaller deals they don’t have time to handle.

If you add value to them, they’ll be happy to return the favor.

This isn't always the case, so I would encourage you to talk to your lender about this before moving forward.One strategy I see many clients use to hold onto favorable rates is by implementing land trusts into the equation.

I'm already pretty set on going this route, but am unsure of how to present the opportunity and structure the terms (to ensure it's a favorable arrangement for all parties). i.e.

If a landlord has a tenant that is "bad" they will want the tenant out and will stretch the truth to make that work in their favor.

He just did me a favor to get me a loan.  

Seems like it would work in their favor. :)

(I realize that I could go to another area with more favorable cap rates etc, but I don't wish to do that for various reasons beyond the scope of this post)My question is if I keep shopping will I find a bank that will lend at a weak DSCR based on my global finances or are property finances always all that matters?   

That being said, if the deal is good I would consider getting recourse debt because the process can be much quicker, easier and they may have other terms that make them more favorable (i.e. no pre-payment penalties, wrapping in more of the loan cost, no money down via seller carrying full second, etc.).