This is great as it is seemingly a big issue but i only see one problem that needs to be solved!
By my eye it looks like you just need a better bank!
Time to go out and find a new preferred lender. Dont be afraid to go the next town over or look for a national lender. Find one that does it at a 25yr amortization and understands the business. I know they exist and i bet there are some that are even a sponsor of this website.
You have come a long way, dont let something like a bank telling you no get in the way of your goal! Go find another bank.
For instance: We built an investment fund and raised $2M based on the assumption that a bank would lend on a 25yr amortization on single family real estate at 70% LTV. Well when it came time to refinance those properties the banks all of a sudden changed their mind and only wanted to lend 15-20yr amortizations and 60% LTV. Well the numbers aren't great for our investors at those terms so we dropped those banks like a bad habit and found the ones that were willing to lend our our terms...and we did!
So get your sales hat on, go out there and find some better banks to make your dream happen. trust me, they are out there.