I think that you dreaming about violent events doesn't necessarily reflect a bad nature. I think that it is inherent to have those thoughts, and usually you just don't reinforce them. Another thing is that it's totally normal for those kinds of themes to occur. Since you focus more on peace and happiness, there has to be a reference to it – something that can make you know that that is peace and happiness, and those references are the opposite of those things. It's
like: you know it's good because it's not bad, therefore it is inherent that bad thoughts are somewhere in there, you just don't focus on it.

Gahn I hope that makes sense, lol. Anyway, about the techniques: what do you think fits your lifestyle best? It all comes down to your comfort and preference. Or if you can't decide, no worries. You don't have to be tied down to a
particular technique, just keep up your dream recall and I'm sure you'll do alright with however you go about having your lucids.