ABS parts are to be removed at 50C. Do not let the part cool down and heat the bed back up unless you have to. The part removes easiest right when the bed moves forward.
Under the cura Advanced tab, reduce initial layer line width to 100% instead of 125%
Under Machine: Machine settings, add some Z offset. The best way I’ve found to check this is look under the advanced tab, your initial layer thickness should be 0.425 or thereabouts. Make a small print and remove the skirt that is first printed. Use calipers to measure the thickness of the skirt. If the thickness is under 0.425, add the different to the Z offset and print again. You won’t get perfect, but it will improve things.
Example: If you skirt measures .4mm, add (.425-.4) = .025mm to your z offset.
For reference, my mini requires an offset of .18mm. Parts stick to the bed well but come off pretty easily depending on the surface area stuck to the bed.
Another tip is you can use the blue handle end of your removal knife to tap on the part. If the part is taller, it can help loosen the adhesion at the base if you tap near the top.