Slothface

The real world equivalent of the bolt release is called a PDQ lever. It's the main thing that been drawing me to the MTR

Not an answer but a look at the real rifle which may point you in the right direction.

Firstly are you using 11.1s or 7.4s? You need 11.1s and you can get ones that fit in the standard grip.

My Vector needed a cut down M120 to get to 350 fps. It sounds to me something is struggling. Even though its new, that means nothing in terms of how well it was put together. 

Take the box apart. Check for missing teeth, bad shimming, over grease etc. 

I had a Vector and its was really snappy in stock form with an 11.1.

So while this will be obvious, you have an issue somewhere and you are going to need to get into it to work out what. 

Also the vector has propriety parts. So yeah... This could be fun for you. 

That said, it might be that you are feathering your trigger faster than the gun can actually work.
That being the case, a short stroked or dsg gearbox is your future.

What are your other AEG's?
That's where a MOSFET is used.
 
I'm sure someone here can tell you which one you would need for the Vector though I believe its a pain to fit one in that gun.
 

Unfortunately that does sound very sluggish which makes me wonder if there is some cause of additional resistance slowing things down in the gearbox. could be anything from awful shimming, burning out motor or even just low voltage(Flat) batteries so it is probably worth sending to a tech if you're not confident in opening up yourself. someone like Negative airsoft with a good reputation should be able to sort you out.

If you do want to go down the mosfet route for precocking a Gate warfet may be an easier option, but whatever is causing this needs to be looked at first really.

Yep. Mags in his pouches are PTS EPM mags. 100% Airsoft gear.