If your goal is to grow faster, buying rent ready properties isn't the usual way to do that if you have limited funds to start with.

Get knowledge, follow experienced people, and leverage wisely.My Take:If you have two houses, excellent credit, and motivation to build wealth, you can learn to manage your money responsibly.Use HELOC, credit cards, and business credit funding to leverage your cash and buy properties faster.

They should be proactively communicating with you as to why they can't find a tenant and discussing options with you.PM's do get busy, so before firing them, try to have an open conversation to find out why it took so long and what can be done to rent faster in the future.

I'd add, talk with your Realtor about what numbers it needs to be at to make sense.

Maybe the 300K properties cash flow much higher, but the 600K property appreciates much faster?

I have bought properties that needed to be at 40% and I have bought properties at 90%.

I do mid term rentals during my STR dead season(3 month period) and the furniture gets beat up.

Under $100k, were talking Old, beat up, it's coming with issues and the vast majority of time there is hidden uglies that come out later. 

They get a faster and easier sale because buyers can imagine higher future rents.

Way simpler and more protective for everyone for about $30/month.Out of curiosity, will you be at red stick REI in January?