I'm all for the Heavy table. Having to choose muscle skills to get Bulging Biceps sucked. And it makes sense that gangs such as skavvies, who have the technological sophistication of scurvyridden 16th century pirates and use nails as ammo, don't get to take a skill that makes them take super-care of their weapons. If this makes the Skavvy rules underpowered somehow (but I don't really see how, it's not like they're a shooty gang) then the fault really lies with the skavvy rules, not these skills.