However, I'm finding it difficult to increase my calls and consistently make 2-3 hours of calls a day while keeping my day job, and I need to be making more calls to get more deals as I find myself spending most of my time with follow up calls. 

I agree with this, but I do think you are better off getting them out as inherited tenants increase risk.

Do I concentrate on paying it down and increasing my credit score?

My lender says it makes sense to at least refinance even if I wasn’t cashing out to get rid of PMI and have increased tax benefits from the increased interest rate.

But being that it's increased so much it's got us thinking... 

Any considerations I should be giving to purchasing via private sale?

The tenant may withhold the difference between the old rent rate and the new increased rate.

It seems here in the Bay Area, it is starting to soften, DOM increasing, some sellers having to accept lower than listing price.

This change alone stands to gain me ~$150k+ in equity due to the increase in NOI.My concern is that firing this PM may prove complicated due to his status as a tenant.

Is it better to do a small increase and increase my chances of them staying?