Martin if you're not into "Twiss" and "Toppa 5" I... don't know what to say. Those tunes strike me as being at the very heart of what I like about funky!
Though I do find it interesting that you refer to the lack of momentum of "Twiss" as compared to speed garage.
You could say the same thing about a lot of 2-step vis a vis speed garage as well - the shift from say "Find The Path" to "Madness on the Streets" (both two of my favourite tunes ever, and in some ways similar in their construction) entails a shift from hurtling momentum to a kind of darkside cruise control.
Tunes like "Twiss" are too lopsided to have that sense of cruise control (which is the grime heritage coming through), but in some way the appeal of the tune rests in its inability to achieve momentum, that staggering groove is very arresting.
(actually I would have thought "Twiss" would go down well with dubstep types)
Whereas yr more 4x4 funky tunes generate a lot more momentum. Esp the piano stompers (Seany B's "Stompa", Funkystepz's "Trinity Hill", Fuzzy Logic's "The Way You Move", D-Malice's "Visions", Wookie's "Gallium") - but these don't have much of any of a ragga-ish vibe to them.
I agree that "Toppa 5" sounds like Apple, but I like it more than any Apple tune, if only because it's better put together (also I should note that it's unlikely to be a belated Apple rip-off, it's been floating around since early last year at least).