Glad you found something that works for you and the wife. I knew Clay at Fuquay Gun and Gold would take care of you. He is a straight up guy and his prices are very competative. If I were you I would go to the KTOG (Kel Tec Owners Group site and forum) since they have a lot of info and help for KT owners, including info on how to do the famous Kel Tec "fluff and buff" to smooth out your Kel Tec pistol a bit.
KTOG.Org - Kel-Tec Owners Group
As far as helping with grip I would suggest the Hogue Handall or Handall Jr. You can trim them to fit if needed and it should work well on the PF9. Clay should have them in stock and so will PDHSC in Garner. Below is a photo of one on my CW40. It help with softening recoil a bit and helps your grip with sweaty hands but it does increase the width of the grip some and this may effect your wifes grip. The Wally World in Fuquay had a lot .22lr ammo in stock last week. I also was in the one in Morrisville last week and they has .22lr also.