I don't accept last month's rent and this is one of the reasons.In the future, put language in your lease renewal that any rent increase will require an increase to their last month's rent to match the new rent rate.

And even the best "color matches" are rarely good enough to be unnoticeable. 

It's typically going to match the cost of the 3.5-5% down payment so just be mentally prepared for that.

I am embarking on Wholesale RE searching for homes that have potential and investors to match them with.

Quick back of the napkin math with very limited details tells me your extra payments on the points plus higher rate and PMI will match your initial extra 12% downpayment 25% vs 10%+3 points) in about 7 years.

Is it ok to mix and match appliances or is that tacky or not normal with potential buyers?

Rentals are often a PITA and it sounds like land-lording isn't a good match for your situation.

You should also check property tax records for the grandma's house to see if she actually owned, and confirm the name on the tax record matches what prospective tenants provided you.

I’m looking to bring and Add value to a syndicators workflow/pipeline if we are a good match.  

One quick look would tell you it’s in probate, or the seller name didn’t match the listed owner name.