The issue I'm running into is that the client has a low credit score (below min FICO guidelines) and with her on the loan, they wouldn't qualify.

$20K a piece would be very low

Taxes were low and the tax buyers typically didn't buy those fifas because they knew that owners had abandoned those houses and they'd just be sitting on those fifas. 

Another reason I would sale is based on our “current” risk reward level.  

High risk/effort and higher yield or low risk/effort and lower yield?

This strategy is also the best way to get into real estate investing with low risk.

Market rent for each is 1950-2100 (the 1600 tenant was there when I bought it and super low rent but great tenants so i made a plan with them to raise it to market over the next three years as the jump would be way to much all at once). mortgage currently with insurance and taxes escrowed is 2100.I have a really low rate which makes this decision hard but the equity would help me fund the next 2-3 deals and enable me to start scaling faster

Not too low either, you don't want to go with someone who is just focused on price as this is a quality of a not-so-great accountant.

I'm a first time investor, about 40 years old,  looking to take over a family property.  Property is worth about 600k market value.  We feel good about this as it almost sold awhile ago for this exact amount and has b...

Not too low either, you don't want to go with someone who is just focused on price as this is a quality of a not-so-great accountant.