The move to the new engine has unfortunately caused saves edited with a save editor to become incompatible.
Statistics can be changed without using a save editor by using Ren'Py's console (Shift+O). To advance Rachel's trust with one point you'd type:
$ r_attr.set_trust(+1)
To set her corruption you'd use r_attr.set_corruption(+1) (or +100). The attribute objects for the other characters are called l_attr, b_attr and m_attr. Hope that helps!