So I chilled the bacon for about 45 minutes in the freezer and sliced it on '3' as recommended by Wade, which was the perfect thickness.
I think I was applying too much pressure on the first block and curving the bacon, so the slices were a little misshapen and the bottom had some curious angles on it.
Second block I just let the slicer do the hard work and glided it by. Much quicker and easier.
Great fun 'toy' and didn't lose any finger tips.
Thanks again for all the brilliant advice.