Are there other approaches to balance my goals of reinvesting while being considerate of the long-term tenant?

When it comes to turnkey investments you are paying for convenience essentially you are approaching it like a stock or paper asset when it is very much not... meaning that at some point it needs to be actively managed and evaluated and etc., etc., etc. for example finding cash flowing investment properties which meet your ROI goal of 9% is NOT HARD heck almost every state (and likely every state) has a market which will achieve that but what does 9% mean without a dollar value if 9% is = to $200 or more okay that’s okay but if 9% means $25/mo. or alternatively if 50% ROI means $25/mo. doesn’t really matter much since although labor differs from area to area it doesn’t differ that much and also doesn’t really leave much room for error — so your minimum accepted ROI should also be couple within a minimum accepted $$ value (cash flow) and other minimums as well (i.e. min. equity, property types, property classes, etc.)Lastly as I mentioned achieving a 9% ROI is not hard and is achievable in every state; the HARDER part is to 1) achieve that AND 2) achieve 10-20% min.equity on the buy in or ARV AND 3) meeting your min. $ value AND 4) buying in a good/stable neighborhood/market AND 5) buying with some type of upside AND 6) etc. etc. etc. —- Again I’m not saying you have to do these things; it all depends what type of investor you are and what you are looking for however it is important to understand that if you shift the responsibility of either identifying the invest property or managing or any other aspect there WILL be a trade off — in this case the turnkey company has delivered on your goal of 8-9% ROI (projected... so TBC) and in return you have traded some of the other benefits of investing in RE for the convenience of not having to do much more than to look over the properties they have sent you and funding it from the comfort of your home, office, etc. ... again if this is the goal then you are on point but if the goal is to also partake in ALL of the other benefits of RE then you should understand that and not be surprised that it’s not a ‘stellar’ investment that checks all the boxes.

I wanted the guests to know what to look for as they approached the property.

You might approach your previous lender and explain the situation honestly but tactfully.

For those who are proactive, these resources can be incredibly beneficial.3.

You can check out their thoughts on how to approach seller financing here: Making Your Primary Residence the BEST Investment Ever (Better BRRRR!) 

This approach ensured minimal holding costs and a faster return on investment.

I've heard of the whole 2+20 (2% fee + 20% of profits) approach with hedge funds, but haven't heard of performance caps before.  

In answer to your question, consider the value of the materials and the likelihood that it could go wrong before taking the approach of buying it yourself.

So you have that approach as well.