IWTL How to make fluffy vegan puff pastry

all my tries so far are mediocre at best.

Be it temperature or how I am doing it I dont know what exactly I'm missing.

I am using smart balance as the fat for layering. Obviously there is difference in margarin vs butter, how does this effect the end product as far a cooking if done right?

My attempts lave it doughy in the middle.

Keep it colder longer? Gentler kneading?

Any and all advice appreciated!