Its a clutch, throttle issue. I had the same thing when learning to drive the Clio, the Impreza and Elise are totally different in terms of pedal, gearchange feel.
I was maxing out and then changing up and the thing would rev its bollox off and sometimes I would get stuck in a gear change.
This is due in my opinion to not knowing the feel of the Clio and FBW is different, the engine being tight and holding onto the revs and not dropping off quickly and also (& I have only size 9 feet) getting my foot stuck, when depressing the clutch under the steering wheel rod which is directly above the clutch which meant that I was not depressing the clutch all the way.
Also, the seating/wheel position is pants. So I have the wheel set to the lowest position. Problem ive also found is that Ive always driven, when pressing on, with my foot resting on the clutch,,, but the clutch travel is all the way to the top so I was infact depressing part of the clutch, its very sensitive.
Give it a 1000 miles to loosen up and get used to driving it and let let everyone know.
As an example, I have not driven the Impreza for 2 weeks and when I went out on saturday, I changed from 1st to 2nd and it would not go into gear,,,, it got stuck short,,,,, it was only when I went back to neutral and then did it again,,, did I realise that I was infact in 2nd and that I had forgotten the feel of the short-shifting box I had put in the Scooby. So it just goes to show how easily and quickly you forget the feel of a car!!!! Its the same as if youve been Karting and then you get back in the car and for the 1st few miles, you think the steering is all wrong and too light, but its just your brain having adjusted for the Kart handling and steering.
172CUP