Regarding your problem : did you get an EML light? Best thing would be to look then to the fault codes. Otherwise, maybe you turbo is a bit dirty and variable geometry was getting a bit stuck?
My advise would be, when you need to accelerate to do it strongly with middle high revs (2-3k rpm). If you do not have to brake after, it is also very fuel efficient and this will help your turbo to get often enough in the right geometry.
I don't have this problem, but I do have enough of uphills to make my turbo work a lot
