and it has an AAAA (like, what the hell is four A?) battery
snaller than a AAA [as you might expect]

https://en.wikipedia.org/wiki/AAAA_battery


ok you are using wacom drivers to drive a non-wacom pen on a non-wacom device, ie Lenovo Yoga 320 - right?

so you might expect some issues along the way

if you are using wacom drivers then if you were using a wacom tablet/pen you would be able to use the wacom pressure sensitivity settings - but I'm guessing that you can't because no wacom tablet is connected - that may be the root cause of your pressure issue with xara - xara does not have any settings of its own, it will rely on the wacom drivers in their 'normal' configuration [wheras other programs may be more 'flexible']

it might be the root cause of your other issue too, I don't know I have non of these problems using wacom cintiq with xara

it would be nice if xara incorporated a pure vector pen like inkscapes calligraphy pen - this was asked for years ago, but in the current climate of xara mostly offering web features and fluff I am not going to hold my breath

pity