I actually no exactly what you talking about ...
To bad I'm 12 years to late to talk about it ..anyhow ... I have the same sluggish issues with my dominator not only am I trying blast out really fast double bass, but when try to do fast articulate patterns , it's like running throw mud .ironically the pedal,aside from these issues, is a flawless machine adjustment are exactly where I set them these are set just two singles.
I've noticed , what I think is the issue ...its rebound. On my iron cobras , they ran standard pedal springs except tamas are a little heavier , for tension ..I ran on the joey jordison school of putting the tension the absolute max!!! What this does ,is gives you this almost instant re-bound (after you've strengthened you legs) .and the gives to instant reaction time , I can only imagine house more pronounced the effect would be if my old cobras came those cobra coils (underside springs ) all of tama"s new pedals are fitted with.
Sadly I think this is where are trick pedal falls short when I lay into my bass pedal ...eh . it. just sorta makes its way back ,,,:lol... The rebound is awful its quit as lightning TO the head ....but sorta gets back whenever ...lol
There's is a pedal company that makes the Darwin ftw pedals, that offers a ray of hope it's a one man op. This company and he offers parts built to replace and remedy some of these issues ..and it all sounds awesome ...
But at the end of the day, I'm just gonna go back to my tama roots and buy me those dyna- sync pedals

If I follow through on it I'll post again
I think you look at better pedal options as well.
Good luck