I was having some issues with hand numbness on my old tourer. The thing that made the most difference was raising my bars. I got a Nitto stem (Technomic? Something like that.) I ended up with them slightly below my saddle, but the numbness mostly went away. I'm from the "tweak it" school of bike fit. I like to tweak my fit a little at a time, ride, tweak again, etc. It gradually gets nicer and nicer.

I don't adjust my bike because someone says I should, but if a person whose opinion I value suggests something, I try it.