Mamba Max motor possible mis-labeled?

Well, I've got my Mamba Max setup running around in my jato with the 7700 motor..... Way way way slower than I expected with any battery I used...

Gearing is good, I get about a 14:1 ratio in 1st gear, and a 10:1 ratio in 2nd from the pinion to the wheels... It's just slow as stink :(

Top speed is slightly faster than a brushed motor, but nowhere near the power to weight ratio or top speed that any of my 18th scale mambas have.... My Mamba'd RC18T would smoke this thing in every aspect, acceleration and top speed.

Is it possible my 7700 is not actually a 7700 but one of the lower kv motors? Could this explain the seeming lack of RPM?

Specs:

Jato, stock 2 speed trans, diff ect
55t spur
15t pinion
Mamba Max ESC
MAmba Max 7700 motor
GP 3300 cells at 7.2v
Deans connectors

And honestly, I'm very very dissapointed in the setup... Everybody is praising this thing and IMO it sucks :(