So a healthy buffer, and then from there they'll be working annual increases in that range I mentioned before. 

I would agree that it is "normal" to have that cushion and buffer - but yes, errors and mistakes are endemic in the servicing industry unfortunately

Another lesson I learned was to have a more concrete scope of work to help create a more accurate budget and to add a buffer in the plan for things that come up that are unexpected.

I'd recommend factoring in a bit more time for how long the rehab will take to be on the safe side, but I do like the MISC Expenses buffer that you put in there. 

Make sure to add a 5 to 10k buffer to your rehab estimate.

Don't Refi - at the very least get a 2nd mortgage and keep your cashflow closer to 350 a month to have a buffer for repairs and cap ex.

A builder may not know all of the overlapping aspects that affect the build and design - setbacks and buffers for example.

This positive cash flow will provide a financial buffer and support your long-term investment goals.Multi-family (MFH) and single-family homes (SFH) are distinct asset classes with different characteristics.

Once tenants loose that buffer in their bank account to pay on the 1st of each month, they are going to struggle to keep up. 

It gives you a buffer in case you made a mistake.As you educate yourself you will find other formulas that you might like.