I don't think this is peculiar to the new TP. With a high-velocity low-acceleration...
Oops, this is partly a duplicate of bug 380, but with a bit more information.
Stepconf is broken in several ways on wheezy
Package "glade-gtk2" from Ubuntu Trusty for Debian Wheezy
I'm reopening because we still need to figure out how we want to get this installed....
add G5.2, G5.3 (NURBS) to G-code quick reference doc
Also G5 and G5.1
G5.1 insufficient checks for degeneracy