There are so many rentals in the area, probably on shared wells, so those people have either decided the STR use is okay or they are comfortable risking it.My intuition is that any actual disagreement over water usage could be handled with the other owner; but the risk would be if the other owner just doesn't like the STR and wants to use the well agreement as a reason to demand it be shut down.Any advice would be greatly appreciated!

In the end we decide to go with Digb because the also handle the taxes and multiple LLCs really well. 

Cost of living is also lower in Lansing so repair costs are lower.You will want an excellent, locally property manager that handles management and repairs, along with an investor friendly Realtor, CPA, lender, insurance agent, and attorney.To Your Success!

PayPal is the only commonly used app in this country that handles transfers between countries and it is quite expensive.I've chosen wise.com for my international exchanges. 

I'm just being extra careful (as I should) with the local team handling the transactions.

Are there other ways to reduce my mortgage that I am not aware of (besides refinancing)?

An option for you could be to go with a DSCR loan with a reduced prepayment penalty period so that you can get funds soon and if you want to refinance next year or the following due to lower rates or wanting more LTV than you're able to do so.You should look at this one with the mindset of:1) What would my expenses be once I refi vs what they are now?

If that doesn’t get a response, you could offer to split the cost since it’s a shared liability.If they still don’t respond, you might have to handle it yourself for peace of mind — as frustrating as that is.

Personally looking back at it switching into LLC was a more of a headache for me and did not do much for adding a level of protection that insurance did already handle.  

The way that things like this are typically handled is that if a lawsuit were to happen, since both people have been behaving under the assumption of a lease (the landlord renting their space and the tenant paying rent), they would probably treat it as if there was a standard month to month lease agreement.