Not sure if mine is the same as yours, yours does sound worse, but when I changed from a Nissan Tino I found the similar difficulty pulling away from a standstill, especially at roundabouts when joining into slow moving traffic. Unable to give it much “welly” I experienced a couple of stalls. Felt like a learner again. Anyway, I must have quickly picked up the new driving technique, as I have had no problems since the first few weeks of owning the car. I had forgotten about it until I read your letter.
Hope this offers some reassurance.