when you design a model try and not leave sharp edges or pointed corners. I print a lot of abs but most of what I print is small .. long thin stuff warps more. Having the enclosure at a stable 50C and no way for out side air to enter will go a long way to stop warping. Also a very accurately level bed with the z offset set to just .02 closer then perfect (perfect being the item printed is exactly the height of the object) will also help. You may want to try Polymide tape rather than painters for ABS..
Good luck!