The total fees we were quoted from one lender initially were $50k on a $6ook DCSR between origination, closing/admin and title, seems excessive?

Have never heard or experienced that...we try to do excessive due diligence during contingency to ensure that doesn't occur.

It was a nightmare to try to charge tenants because so many just used excess water all of the time...like leaving the hose running overnight on a driveway. 

If your broker markets the sale properly, you should be able to recover at least the excess in commission.

You should only consider switching when your current software has a significant flaw or lacks features that force you to spend excessive time on workarounds.

If the cabin were cash-flowing, we might use the excess cash to continue paying the loans over time and bet on the equity growth to continue to be a positive for us.

People are running their entire house from solar and selling back the excess to the electric company. 

If you can generate a return in excess of 8%, then you can borrow the down payment from private investors, or even the entire purchase price if your hard money loan was at a higher rate than this.

You should only consider switching when your current software has a significant flaw or lacks features that force you to spend excessive time on workarounds.

Even if the homeowner got the excess funds imagine the bid is $100k.