I also love buy and hold and cash flow investing.

A Cost Segregation study is an IRS approved federal income tax tool that increases near term cash flow by utilizing shorter recovery periods for depreciation to accelerate return on investment.

I'm locked in at 3%, but let's say I refinance at a higher rate where my mortgage only goes up a couple hundred dollars, but I'm still able to cash flow, does it make it worth it?

I would caution against the risky play with high cash flow. 

If the funds touch your accounts, you lose your tax deferment.Below is an illustration of the flow of funds during a 1031 exchange.

So much for an LLC protection.Here who is being sued:Federal Trade Commission, andUtah Division of Consumer Protection,Plaintiffs,v.Nudge, LLC, a Utah limited liability company; Response Marketing Group, LLC, a Utah limited liability company, also doing business as, 3 Day Real Estate Training, Abundance Edu, LLC, Affluence Edu, LLC, American Money Tour, Cash Flow EDU, Clark EDU, LLC, Edge 2 Real Estate, Evtech Media North, Flip for Life, Flipping For Life, Income Events, Insider’s Financial Education, LLC, Leading Financial Education, LLC, Onwealth, Power Flip, Prosper Live, Property Education, LLC, Renovate To Rent, Simple Real Estate Training, Smart Flip, Snap Flip, US Education Advance, Vintage Flip, Visionary Events, Wealth Tribe, Women’s Empowerment, Yancey Events, Yancey, LLC, and Your Real Estate Today, a Utah limited liability company; BuyPD, LLC, a Utah limited liability company; Brandon B.

You should focus on deal flow and funding, and funding should be a great lender/broker.

What is your long-term goal, is it strictly just cash flow or to continue to build wealth?

You can almost get 6 units for the same out of pocket investment buying separately as you can buying the 6 unit, potentially slightly less cash flow with a better rate and less stipulations.

Thus, if you do not meet the current rules, you may wish to be prepared for a reassessment for property taxes, which could change your cash flow analysis drastically.