True, you will also get depreciation to reduce your tax bill on other earned income, and you will also get amortization (loan pay down) and possibly appreciation, but 6% is pretty meager. 

They can be very time consuming and stressful in some cases just as an upfront FYI.

Anyone have any efficient methods to reduce those costs?

I would let them out of the lease with no stress, BUT let them know they are responsible for my lease break fee. 

What about solar on the roofs to reduce tenant costs? 

L.T.V. can be reduced if the debt service coverage ratio is too low.You are likely to have to leave some money behind in the deal if you are BRRRing. 

Many are also waiting for their employer’s official policy on remote work or working from home going forward.Compared to earlier this year, more sellers appear to be reducing asking prices after going on market.

She got less rent than market rate, she's being actively sued by the renter who refuses to leave the home or pay any rent for six months, and after paying all the attorney fees and dealing with all the stress she may still have to sell it to him.

I did call and talk to the water department and they said if you are unable to get a refund from the seller, they would consider working with you to reduce the amount owed."

I recently went to my personal bank (the one that I have the HELOC from,) looking to refi my existing HELOC with the idea that I could reduce the rate a bit, and increase the monies available at the same time, giving me more capital to work with for future purchases.For the first time in my life, I was declined.