I was 250 front 185 rear before the swap. Now I'm 350 front and 185 rear on the street and I find it very well balance with the rear sway bar. Although, the Charger is pretty light in the rear an a two-seater, so prob why such a light spring works so well. A little more in the rear like your 224's might be nice for your application.
I run 900's in the rear at the track.