What's the ink you're using?I have a Parker that writes too dry and that went in for service -- it still writes too dry for my taste, but I think it is probably within range of personal preference.
To my eye, the TWSBI nib looks properly aligned. I don't know what the problem is. Even more puzzling, I have no idea why TWSBI could not correct the problem in two tries. Seems like an easy fix would be for them to just replace the nib. I can't imagine that a service person or anyone who had ever used a fountain pen would pick this one up and think that its behavior was normal.
Try a better flowing ink! A bad ink will make any fountain pen feel scratchy.