there does not seem to be enough rudder authority to counter even a little aileron. I had a vision of screaming-in sideways while shedding airspeed and altitude and plonking it down on the numbers! That may be Sky God level? Or maybe the little Cessna just doesn't do that ?
'Should.... Have you satisfied yourself that you have applied full rudder? I have had students in the past who told me that they were applying full rudder, and when I pressed the pedal, I was able to apply a whole lot more rudder. Yes, you should be able to come in sideways, and plonk it on the numbers, this is a skill I teach. I really like slips, as you can modulate your descent rate by applying and removing slip. Once flaps are extended, they're there.