It is very common that they will subcontract out some of the more specialized work. 

You should schedule a call with all 4 and learn what they specialize in, the markets and how they operate.  

Find a good insurance person that specializes in what you're looking to do and have them look at deals before you buy them, it's a crap shoot right now. 40% isn't too crazy for the exp ratio without mortgage or replacement reserves, I definitely wouldn't go below that.

You could probably just do the search yourself (Google etc), however skip tracing companies specialize in this and you're really paying for the expertise and YOUR TIME.

I would call every "handyman special" sign you see hanging on telephone polls in your market.  

If you want to be a career landlord, find a landlord attorney who specializes in property management operations.

Consulting with a local real estate agent who specializes in vacation homes can provide valuable insights and help navigate the intricacies of the Seattle market.

Home Depot was easy to work with and they ended up lowering their initial price for my kitchen from 2900 to 2100 and gave me a $200 Home Depot gift card for the number of problems we had with missing parts.

If the tenant doesn't already have a wall mount I tell them that I will purchase it for them as a move in gift. 

@Emelie Deans Finding a CPA that specializes in real estate taxation is definitely a necessity to be able to take advantage of all the tax strategies.