Have you got access to a hyd bearing press? Wood on top scales underneath sorted.

Take a measurement from floor to arch on the front then Jack the car up in the centre of the back "axle" an inch and remeasure it at the front and do the same on the front end and that will give you a bit more info to if your springs are too "heavy" and also how much weight is on the front and rear it will also show you if you have the axle sharing the weight equally when you adjust it if you have no change you might need to jack the platform up on the back to bring more weight on to the front - Remember when you adjust the platforms it the diag opposite corner to move.