The "nukes" are the Force Vital spot series. They don't do any damage, instead they deal status effects, like lowering parry ratio, lowering attack rating etc.
Here's a more detailed look at them:
http://sro.mmosite.com/database/skills/ ... er.shtml#7The point of going 5:1 STR hybrid is the following: you deal more damage than pure STR, and you can also use a higher level snow shield than a full STR user, given the fact that you have more MP. The downside of this is the loss of HP that incurs.
Also, you can consider leveling with light to a certain point, then deleveling it, and adding force. Force is only really worth it, IMO, at level 60+. Indeed you lose parry and magical damage, but think of how much you gain from the force de-buffs. Impotent status makes opponents hit lower on you, while division, decay, and the loss of magical defense make you hit harder. These factors DEFINITELY compensate for a loss in parry and magical attack.
Hope this helps.