But you sacrifice bass depth, definition, and control with wider bores versus Sony hybrids and stock tips. You still won't get sparkly treble with wider bores, though the mids and treble will sound a little better.
This depends. I find this to be more a function of the type of silicone used rather than the bore size. If you use a thinner silicone it will have the effect you say w/ less impact, focus and loss of control. An example of this would be something like the Meelec M9 'balanced' tip. The wide bore bi flanges I use have thicker silicone and tend to really balance out the Monster signature w/o sacrificing the bass quality. It simply doesn't slam as hard and big as say the stock supertips but all the other qualities are intact. So IME what you describe is more a function of material choice rather than bore size. I use wide bores on the Xcape and the DDM1/2 simply because they have large nozzles. They don't suffer in bass response because of it.
On the other extreme, Sony hybrids will help the Coppers achieve the most focused, subsonic bass possible, but you sacrifice mids and treble balance a bit.
The stock tips are a really good mid-way compromise between the two extremes, in my opinion.
I agree w/ this part except I find the stock tips do enhance the sub bass as well though YMMV based on tips size and fit, etc.