I haven't played with the Blade 100, but I can shed some light on the Gravity vs. Speed. I've also played with the Ezone 100 so I hope I can point you in the right direction.
Sounds like you've played with the Speed already, and in my experience I found it to be a bit muted, firm, and powerful.
I thought it was pretty stable, but this is coming from the perspective of someone who mainly plays with the Gravity MP (stock).
The main differences between the Speed and Gravity, is the stability, power, feel, and maneuverability. Even though the Speed is more powerful, you might get similar, or even more power, with the Gravity as it allows for a faster swing.
The string bed for the Speed is a bit more open than the Gravity, but they're both relatively open IMO. I find that I can generate a good amount of spin with both rackets.
Stability on the Speed was much more apparent for me compared to the Gravity. I find that directional control to be easier on the Speed because of the stability, but its launch angle is a bit higher so it doesn't give me that laser-like accuracy for flat driven backhands. Similarly for the Gravity, I don't feel as confident when aiming for the lines. For reference, I'd consider the Blade 18m to be one of the best rackets for this attribute.
However, the feel of the Gravity is much more direct. So if that's important for you, I'd pick the Gravity just for that reason alone.
If the Speed is not stable and consistent enough for you, I'd say you should consider the Percept 100D.
Also, from these rackets they don't have that much of an influence on the quality of my shot. I believe that slight adjustments to my technique would allow me to have similar results regardless of the racket I pick.
So, personally, I'd select the racket you like the feel of the most.