The "visor" is just a skill that temporarily gives you a high radius of trap detection when you activate the skill. Turn it on as you enter a room so that you're not suprised by the traps. The skill only grants you 1 leather cap, if you have more than one leather cap then the bonuses are somehow applying more than once for some reason. I know there have been issues with mod installations for mac users. If you use a mac you might want to consider manually merging the files together into the same mod. This can be tricky to do if you've never changed the game files yourself. the trickiest part is merging the XML files, which is essentially a large copy/paste operation.