Just send me a DM, I have a solution to what you need

Have you explored any other solutions than bleeding for 2-3 years?

If you get creative you can find solutions.

You are too stupid to call me because you are a troll....not looking for solutions.

At that point, it's worth researching and finding a solution that better meets your needs. 

As far as your proposed solution seems like it should work in terms of getting you a “first position” HELOC.  

At 7 doors it's not necessary, but of course software can save you time, especially if you grow.If you plan to scale beyond your current size, I would echo other folks above that you should look into one of these more robust software solutions sooner than later (re: Buildium, AppFolio, RentVine, etc.)

Are you able to get good returns with them or have you found solutions to the frequency and specificity of rental inspection repair requests? 

But as a short-term solution, playing the 0% credit card game can be an option, but from my experience, juggling from one to the next with no backup plan often ends in paying high interest in the long run.

Investing outside Florida and considering remote management and property management are viable solutions.