1. 10% bonus to strength means 10% bonus to strength, there's no hidden meaning to it. If you have a 100 strength, then you get 10 more because 10% of 100 is 10, and adding them makes 110. This goes up if your strength goes up.
2. a Mix of both. Onslaught if you're fighting canon fodder, you need a bunch of extra damage just to kick them down faster. Calculated Strike for a boss, you're going to do crap damage with onslaught or not against it, so might as well just take 3 strikes of crap damage and a good strike of decent damage on a boss.
Also, slow down on the keyboard mate. Your typing is kinda hard to read, which makes it hard for us to help you.
