No, PKO also gives me that same dry irritation -- I use palm oil, and I get plenty of lather. I also prefer using Morton's popcorn salt for the salt because of its very fine texture.
http://www.amazon.com/gp/product/B00EZK6L40/?tag=skimlinks_replacement-20
I think using a fine-textured salt helps the bar function better. You get a more uniform salt and soap mix in your lather every time when using it. When using a coarser salt, the outer soap matrix holding the salt together tends to wear off first, leaving a crust of salt surrounding the bar. Since soap is softer than salt, it washes away faster, so after the first use, you'll always have more contact with salt than you do soap. This stays constant through the life of the bar.
Using an extra-fine salt produces a smoother bar, and as I said, a more uniform mix of salt and soap during each and every use.
I know I'm being waaaaay too picky once again.