No adjustment is possible. Although you changed the sensors, did you thoroughly check the reluctor rings?
One of the commonest ABS faults is cracked or corroded reluctor rings and they produce the symptoms which you have described. The cracks are frequently invisible to the naked eye and only open up when under rotational loading so they need testing using dyes specially designed for the purpose. Click here
if you don't know about these. I'm not suggesting that you purchase a kit: any decent repair garage will routinely have these as will all good professional engineering workshops and for a small charge they can test for you.
Cracked reluctor rings cannot be repaired:they must be replaced and usually aren't cheap. Some are only supplied as part of a new driveshaft/hub assembly, but there are plenty of independent third party suppliers who will supply the rings alone. To fit them you cold chisel off the old ones and thoroughly clean the mounting area and then heat up the new ones until cherry red before slipping them onto the shaft. As they cool, they shrink to fit. If you get it wrong, you have to chisel it off and start again so it's only to be tackled if you are confident in your automotive repair skills.