Sorry you have had issues with your Walther PPK/S .22. If you want a .22LR Pistol for plinking or light defense, I would recommend instead a Ruger SR22 or the new Taurus TX22.
I've been very well served over the years with a standard Ruger MkII .22LR, but it is not sized for carry.
My Interarms/Walther PPK/S, albeit in .380 ACP, has been a very trusted carry Pistol for many years. A very very accurate little Pistol, for what it's intended use is.
The only work I ever had done to it was to have a local Master Pistolsmith polish the Feed Ramp for feed reliability.
Yes, the Slide will bite you if you get your grip too high and the lower Slide edges tend to be razor sharp.
Learned that the hard way, as you can guess. I glued a 1/8' neoprene pad under the frame grip beavertail to help keep my hand from getting sliced.
My .380 PPK/S has now been in semi-retirement since my late production pre-G2 Taurus PT111 Millennium Pro came home.
Also, I've gone to more mid-size 9mm's for Winter Carry.
Size Comparison of Taurus PT111 Millennium Pro 9mm with Walther PPK/S .380