there is no way to tweak the pressure sensitivity that I know of in xara, it is either on or off

there is a registry key but AFAIK is only has on/off [1/0] values that do anything

I do not know the tablet in question - it may have program specific settings for stylus control - the stylus itself may have drivers that can be so set

restaring everything sometimes works; if the stylus was installed after xara, reinstalling xara may help but run it as administrator first in case that helps