Hey Mooney - I think you're thinking about all this in the right way. It's a similar fork in the road I experienced trying to understand how the heck this scales & turns into a mini-empire.
A few things...
Stabilization --- I generally assume that expenses are going to be out of whack the first 18 months of initial ownership. That is partly because things are missed on the inspection, tenants are settling in, major expenses need to be paid, etc. Generally, once you settle in, things get more predictable and stable. And hopefully you get tenants that stay for quite a long time and get used to the home in every way.
Scale --- There is a reason why wall street came into the SFR space but in order to do so, they needed to scale markets quickly. Margins on lower cost homes, lower vintage homes, tougher areas, etc. have smaller margins. So scale is important. Another reason why places like invitation homes error towards newer homes when they can.
Time --- the 2010's were historic in terms of property appreciation and rent growth. Who knows what the next 10 years has in store but no matter what, you gotta let time do it's thing.