Work has me a long way from the duplex, so having them take care of mostly everything is a real bonus for me, but if I was more local I think I would manage it myself.I think it's worth seeing if your time is worth dealing with the day to day (or month to month) management of the property.  

You might be able to raise rents that high, but let that be a bonus instead of a requirement to meet your numbers. 

I work a salaried W-2 currently (same place of employment for 1.5 years and pays ~$70k per year), but am interviewing for a W-2 job which gives a base salary + quarterly sales bonuses (~$60k per year with quarterly bonuses projected at ~$5-7k).

As a bonus, they generally aren't paid very well at their regular job, so they may be willing to work with you at a price that is great for them and great for you.6) You WILL learn lessons.

Price appreciation in the property would be an added bonus but not part of my NOI calculation.

And as a bonus you have an in-depth knowledge of your area.I dont know if this will help you.    

. --- Added bonus that you would now be 1) more diversified in a way; 2) building equity faster; 3) have more option available to you in the future i.e. sell, refi. etc. 

I will say that the salary offer was 75k with 7k signing bonus so that's about all the money I will have.

The bonus room could be storage or maybe a 3-season living area with screens and access to the backyard if that makes sense but must be finished.

You may find that your money is better spent improving tenant amenities or creating a referral bonus instead of low ROI advertising.