You could start with your agent or a local agent who supports investors and could have contacts to refer to you.Lastly, you could consider negotiating with a local PM to take on a hybrid approach to management.  

I’m searching for an investor-friendly carpenter and plumber.

Water you could have a plumber do it or do it yourself if you do the sub-meter route.

Have you tried searching through local Facebook groups?

I use Mariell Brown from MGA --he's a master plumber. 

Most plumbers have camera systems that can go 100's of feet usually and it is pretty easy.

You're local to me.There's a couple ways to go at this ;If you're looking to save some money you can have your plumber install sub-meters after the individual meters.

In a busier place, you might just be told to find a GC to "un-cluster' what you did.For me, when this happened, I had to go and hire a certified plumber, and electrician, and framer to come in and certify that all the work my handyman did was correct - and to fix the issues that weren't correct.  

Highly suggest coming out to some of the local chicago IN-PERSON meetups! 

., I think you are fine to move on to another plumber.