When I convert a file with 158 pixel to pdf file, I just got a pdf file with 121 pixel in 100% zoom.
wkhtmltopdf --dpi 100 c:\1.svg c:\2.pdf
when I change the DPI, I find't it doesn't work. --dpi 100 is the same as --dpi 1000.
wkhtmltopdf version is 0.11, test under windows and linux.
Try with the --disable-smart-shrinking option