Coil springs guys.... I want to know what length std springs are and there ratings for 2wd and 4wd or escort front and rear.

I need to uprate mine and only know they are 2wd spax uprated 30% std ride hieght.
The roads where I live are very poor and although the car has been raised a further 1" it still bottoms out I have koni front strutts and Leda adj rears which I can harden right up but this gives an unaceptable ride as also have full poly bushes front and rear. (I don't want to go coil overs)
I am happy with damping and travel just need to get the springs right.
I can get them custom made just need a starting point.
Plus don't want to take car off the road for long time
Any help/ advice appreciated.
Mark