This could include skipping RLMO, having a balloon payment, and possibly having prepayment penalties. 

The property location, configuration, decor and amenities factor into who is going to want to rent it and how much they're willing to pay. 

Market participants are waiting to see what inflation will portend for the month of March, including bond traders who are staying away from the 2 and 10 yr.

Headache factor and risk are not talked about enough in REI in my opinion. 

I don't think cash-flow you should be your main factor though. 

In my experience, the agent has been the catalyst for other vendor referrals including attorney, contractor, inspector, tenants, etc so selecting one that you feel is well experienced in this space will help you to connect more dots.

Our current portfolio:-Florida SFH: Mortgage (includes HOA and PM company) = $2100.

The landlord effectively refused your request, since March rent is included in her 'options'. 

This was included in the initial contract we signed when we put the $1,500 deposit.

many people don't necessarily have the time or skills to do their books*REI specific tax efficient advice to include business structures, 1031, depreciation, deductions, etc.