This little piece of art and those paragraphs you wrote are really fascinating! It's very true indeed that Jekyll in the book is not any kind of an angel. In fact, what I've heard is that when Stevenson had writen the original manuscipt, his wife said that it was missing something because Jekyll was bad from the begining and the tansformation only chanced the appearence. Due to this Stevenson threw the original manuscipt to the fire and went back upstairs and wrote the final vesion in three days. (And yet, Bulgakov wrote in the Master and Margarita: "manuscipts don't burn." -_-) I have the a feeling that even after this massive re-writing Jekyll still has some of "the first Jekyll's" evilnes in his character left. I really don't see the book Jekyll as a traditional good guy (but I also don't think that he's a villain) due the fact that he did continue
taking the potion after realizing how evil and dangerous Hyde was. And this even wasn't because he needed to study more, but because he wanted to enjoy the pleasures that Hyde was seeking, if I recall right. But in the same time Jekyll is neither a bad guy because in the end he did want to create something good and help mankind. Things simbly got out of his control when he wasn't able to fully control himself.
And now about Hyde. This new perspective to the book's story shows how Jekyll is in a certain way misteading Hyde. Jekyll uses Hyde's instict of seeking pleasure and doing evil to achive his own goal. Yet, all he does is curse Hyde because of his animalistic behavior even though Jekyll knows what Hyde is capable of when he is let out. Hyde does waht Jekyll wants to do (or this is the case in the early days of J&H duality, I've always been thinking that at first, Hyde was just Jekyll in Hyde's body but slowly Hyde started to develope his own personality and came aware of himself) yet still he is just a mask to Jekyll and a test subject. Though in the same time Hyde also uses Jekyll to hide from the public so that he wouldn't have to deal with the consequences of his actions (taking the child tampling in the first chapter as an excample). But in the same time, Hyde doesn't care about Jekyll (or well, Jekyll says so in the book but in the same time we never hear it from Hyde) and they both start to hate each others for diferent reasons (one could be Hyde's frustation to the way Jekyll threats him) so meaby that explains why Jekyll does threat Hyde that way. It might also be that Jekyll is actually being angry to himself because he knows that he also wanted (at leat a little part of him) to do the things Hyde did but he channels his self-disgust to Hyde because it's easier to blame somebody else than yourself.
But anyway, I'm getting extreamly analytical again. Amazing piece!