How do I revert a TextSpanner's staff-padding after a line break?

[Robert Murdoch]

I'm really sorry to bother you all again, but I can not figure this out. 
In my last question about a Text Spanner leading into another Text 
Spanner, I was finally able to align an accelerando with a ritardando 
using staff-padding.

Unfortunately, after the line break in my score the spanner continues at 
the same height as it was on the previous line, as if staff-padding 
affects spanners after a line break too. I want the spanner after the 
break to revert to 0, but how do I do this?

Thanks for reading.