FYI: Ive had the AC 2" springs up front and 9449 in the rear for the last 2 years. The rear was noticeably taller (3.25" lift overall). The rake made it feel a lot more unstable in the rear end.
Today I cut a coil and a half off each rear spring. Now it sits almost perfectly level and feels much more stable.
I tow with my r50 almost daily and notice very little sag with these springs unless I have a really heavy load in the trailer.