<<My suggestion was mainly based on the observation that far too many contemporary amateur photographers have become overly reliant on VR/IS/OS/VC and as a result become disappointed when unusually low shutter speeds in average-to-poor light produce obviously soft photos.>>
Totally agreed and the higher shutter speeds helped me to largely eliminate soft images. That said, I also learned that inappropriate use of optical stabiliation ie. too high a shutter speed when hand held can be a real problem as the stabalisation gets confused. Something else I learned from Thom Hogan's report on VR.
<<Turns out the OP is using a 35mm f/1.8 and is now tweaking the AF Fine Tune settings and I think also doing focus testing, so I'll wish him luck with that.>>