my attempts at answers: (

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1.) Difference between dark energy and dark matter: Well i'm not sure what makes them different from each other...but I do have a thought concerning why they co-exist with regular matter and energy as well, and it goes back to the collision....maybe the regular matter we see comes from the collision of the two slates of dark energy and matter...the combination of two branes may produce a by-product - the matter we perceive...and what's left after a collision is the overwhleming amount of original universe material mixed with the remnants of the collision
-take a car crash..there are two cars that are unaware of each other...they collide while each car is using 100% of its energy..or going full speed....what results is two damaged cars and pieces of each car everywhere...some pieces fly off one car and into the other and some shards just fly away from the source and land on the street...well take the pieces of the car that end up in the other car....although in their own environment (their original car) they seem to fit perfectly, but once introduced to the other car they stand out dramatically (take a red door into the drivers seat of a black car or something)...on top of that, each car is completely different from what it was before the crash... (and now i'm thinking: what about the shards on the street??)
2.) why more dark matter/energy?...in my original post i kind of explained this....a universe is created out of an empty canvas of Dark Energy...now take the event described above (collision, AKA the big bang, AKA formation of a perceivable universe)...once a collision happens...real matter and energy (or what we know as real) are formed from the collision of two different branes..but let me explain why i think this is possible:
I am a huge believer that
EVERYTHING, when you get down to it's core, is vibrations...i'm talking about EVERYTHING here from energy to conscious thought and emotion...we are all vibrating...which is why you can get good/bad vibes from someone without even really knowing them...you can "feel" out a situation....vibrations are interactions between everything...now when two vibrating entities meet, their vibrations can go well together, like a power chord on guitar (octave and a 5th - perfect intervals) or they can be dissonant like a flat 5 interval, where the wavelengths just don't match up (and don't confuse this for 'bad' necessarily...dissonance has it's own importance in certain ways)...well I beleive that these branes also have they own unique overall vibrations...and the collision of two differently-vibrating branes allows for the by-product of matter...if the vibrations go extremely well together, we can end up with something amazing like a universe that gives life to things like us...it's all in the vibes
and finally 3)...we observe more dark matter than regular matter in the universe don't we? this galaxy may have more 'real' matter for us to observe but that merely means we are living in a higher-density area of by-product
i'm not sure if I understand your question though..if you were talking about why humans actually perceive more matter than dark matter (with our senses [or maybe we do sense dark matter and just don't realize it..?])..then I think that's just because we are from the same by-product...we are stardust as people like to say
still working out the kinks i guess