what knife should i get?
You need to see where the problem in the blade lies. Wusthof GP2 have a bolster and over time and sharpenings the bolster needs to be drawn down.
If so the blade may cut fine from the tip to some point closer to the bolster and then lose board contact because of the high bolster and you get accordion cuts back there.
Probably +60% of bolstered knives I see need to be reduced.
That may not be the problem but it would be the first to eliminate.