I fish from a kayak sitting close to water level and I think the main thing is to stop your rod high on the back cast( important for any cast). I would not suggest that you get a new rod unless you want one. Even with a longer rod you still have to stop it high on the back cast or the extra length will not help. Practicing casting from a sitting position is a great suggestion ... I would add turning you body so you can see what your back cast is doing will also help until you get the perfect back cast locked into muscle memory