For the hand on screen thing I just use a glove with fingers cut out for better control with the stylus. Not all gloves work though, while in store I just tested a few out on my iPhone to make sure.
Does the Jot seem kind of insensitive for you, like you have to press down harder than you do with the Targus or else it skips? If so you might want to try complaining to Adonit to hopefully get some free replacement discs...and then if that's not enough (wasn't for me) use a little something in the disc to give a better connection. For something around the house, toothpaste works (heard about it and worked for me, may differ by types for all I know though), while ideally would be something specifically made to increase conductivity like conductive lube/paste. The material will spread a bit between the disc layers though so make sure to use only a tiny dab.