Been with them 8 years, they've never missed a payment and they give detailed quarterly status reports. 

I would assume the reviews they have with them are on the lower side, and bigger PM companies are known to struggle with attention to detail on properties.

My I ask details that raised red flags?

We plan to be as thorough and detailed in our research and due diligence when calculating ARV and rehab costs.

To be fair, I literally did no Due Diligence, but it open my eyes how you can't trust the promotional blabla at all, you really have to do a detailed review of all the deal facts yourself.

I can share details of properties and if you have airdna, that something we can both look at because i dont have it (and go over what the anayics look at for certain types of propeties in this area). 

Quote from @Bruce Woodruff: Quote from @Peter Mckernan:Up front (First Contact) Red Flags - 1) Everything should be in writing and very detailed 2) There should be a very specific Scope Of Work3) They should not ask for much upfront $$, certainly no more than 10% - if even that.

If you want, you can DM with the details of the project try to get an unbiased opinions, as I've done for many others or if you have any other questions. 

Couple of details that would help the community here: what's your estimated value of house "A", the loan balance, and monthly rent?

I'll skip the details, you'll find thousands of posts on BP on why.You probably want an LLC for your flips in the State where you flip.