First, with regard to the published measurements on Mr. Hubbard's Westwind site (or any other comparable list of shaper measurements), you must remember that shaper tips are made/copied using extremely accurate processes these days, allowing for tolerances smaller than .001 mm. The measurements posted are rounded off, to allow for quick comparisons and to protect the proprietary specs of the product. When rounded to .1 mm, two tips may seem nearly identical, but could still have significant differences in how they perform.
Regarding performance characteristics of shapers in general, I have found the following to be true most of the time [insert "I am only an oboist" disclaimer here]:
-- Wide bellies offer more depth of tone and more overall flexibility, with less focus and pitch stability (esp. in upper register, since the neck and tip must be at least as wide as the belly).
-- Narrow necks/tips offer more stability/focus and better intonation between octaves, but limit pitch "wiggle room" and produce a shallower tone.
-- I think the "proper" search is for a tip that is wide enough in the belly to give you the tone you're after, and narrow enough toward the tip to give you the stability you need to play in tune.
That having been established, it's possible to find tips within the same "family" of dimensions that give you different results in relation to the specific acoustical properties of your instrument. For example, you may find two very similar tips that exhibit completely different behavior only on certain notes (like 2-finger C, or F#, or ...). So, once you find a tip you like, I recommend you continue to try other similar tips until you find the "perfect match" for the rest of your setup.
NOTE: Don't forget about the staple! Different staple dimensions can and will change the way any shape behaves, as will the tie-on length on the same staple. Only mess with one variable at a time if you want "real" evidence of what's going on. Only use staples that fit the mandrel perfectly, to maintain consistency (new staple type = new mandrel).
OR, you could just "learn to play what you've got." I have an ever-growing collection of shaper tips, and sometimes wonder what would the result have been if I had simply stuck with the first tip I ever used, and be done with it! For me, though, it's more about the journey, and I always enjoy finding new things that prove a better match for my "concept" of how playing the oboe should sound and feel.
Good luck, my friend!
Owner, Marzluf Reeds