That's what's coming next, SS is just something I find is necessary, just seems to help a ton, I'm thinking Repairs, then maybe Camo...
I may be wrong but doesn't sixth sense only start once the skill reaches 100%?
What i normally do, is to train a skill that comes into affect straight away and gets better as the crew skill gets higher eg. repairs, snap shot etc.. then when you reach 100+10% skill, u can drop it for a skill that only works at 100% eg. sixth sence, BIA etc...
this way u are getting some benefit from the skill as u progress.