I get better results with abs than with pla
but
with abs I get the corner lifting
with pla I get strings
To resolve my abs corner lifting I add a custom brim to my print, about 5 to 10mm wide, depending on the size of the print, and 0.5mm thick. That does the trick for me. Then I trim off post print. I think the secret formula has something to do with how tall the print is. The taller the print, the more time it has on the hot bed, and a wider brim is needed. It's proportional I think.
to make abs or pla stick to my bed I use http://www.geckotek3d.com/
I love it. no tape no glue no muss no fuss
But always remember Levelness is next to Godliness

...and the almighty z offset