I am having the same problems with the blob being too big (the squirting lasts too long), it getting stuck to the hot end, and being dragged over into the print. This happens every time I print using dual extruders and PVA in Extruder 2 of my Ultimaker 3. There really needs to be a setting for how long the blob squirt lasts.
Another solution would be for the hot end to move up the entire time the blob is being created. Right now it only moves up at the end of the squirt.