Tang live in surge zone on reef tops usually where there are incredibly powerful currents. I have seen sohals and large nasos swim against this where other fish simply stop swimming and aloow themselves to be thrown back, they merely steer themselves clear of any danger much like a surfer. Tang however will push through this and continue swimming. ts true that triggers have a rather unique way of swimming (not totally unique) but again they arent designed for high speed.
The blue reef aquarium where my emperors have gone have some very large fish in there. Their main tankholds 250,000 ltrs and if you watch the tangs cruising around in here you will see just how fast their speed truely is. This tank is full of different tnags, angels rays and sharks etc. During feeding time only the sharks get there faster!
Bluethroats and pinktail triggers dont tend to be true reef fish as they are deeper water planktonic feeders hence why they tend to be far more reef friendly than other triggers. The niger is siilar and can be kept in reefs but i say this with caution as it tends to drift from reef to drop off. My niger had ot go when it decided it didnt like my clowns anymore and hunted them down continuously with extreme prejudice

Even though clowns are poor swimmers they could still outmanouver and outsmart my trigger.. they would rely race against it.. one would dart for cover whilse the other would run the gauntlet, when the runner was tired it would dart intothe rocks where the other one would take over... the niger was a bit stupid poor thing and never realised it was chasing a different fish!
This wentonfor a week and i finally gave in and returned the niger. it was later put in another reef tank with clowns (against my recomendation) and yep you guessedit! it chased the clowns all over the tank. It was brought back to the shop again and finally it found a home ina fish only tank where it was with fish that canhold their own.
triggers tend to cruise at a far lower rate of speed than large tangs and they are very powerful in short bursts i agree but i still have seen no fish in a homeaquarium that can match a tang for sheer pace.