In the LR Develop Module, with Softproof active, do you check the box that says "Simulate Paper and Ink"? If you do this, and you adjust your print accordingly in the Develop Moddule, and your monitor is dimmed-down sufficiently to mimic the effect of reflected light off paper from your printer (depending on ambient light your monitor brightness could typically be appropriately set within the range of say 90~ 120 cd) you should not need to implement brightness and contrast adjustments in the print module. Have a read of Andrew Rodney's article on this website "Why Are My Prints Too Dark". While your issue and the main issue of that article are somewhat different, you will still find useful advice in it.