well here's the catch 22 situation - to clean up your overhangs - you need active cooling.
But because abs is such a bastard to print, cooling it will shrink it.

My advice is to just not bother with abs - period.
And don't bother with benchies either - total waste of plastic :-)

But to fix your problem, you need to work out how much active cooling (fan power) you need to both improve overhangs and not cool the layer to the point of shrinkahe.
Also try adjusting your retraction settings. Often blobs are more down to retractions than to cooling.

But printing abs is always a crap shoot. The material is just not meant for the fdm process.
There are numerous materials around now that are easier to use and have better properties.
You might have to pay a little more - but you more than get the extra money back in non failed prints and better quality prints.