Pine tends to disperse vibrations slightly (I think of it as being warm...in a good way) but nothing about your combo of parts that would suggest a dark sounding platform. One interesting experiment if the steel saddles doesn't help is to capo the neck at the first or second fret and see if that makes a difference acoustically. Not sure if you're using string trees or not so that span between the nut and tuners may be sapping a bit of brightness.
Damn fine looking guitar in the meantime! That body is gorgeous.
Damn fine looking guitar in the meantime! That body is gorgeous.