looking for heavy duty springs for 4motion estate

[passartist]

Hello all, looking to fit a new set of springs to my estate, rather than the usual request though I need to uprate to a stronger spring as when loaded I already hear the odd scrape of the inner arch.

Is there anything off the shelf? I was thinking to ask the stealers but wondered if anyone knew of anything. I like the sport height and don't really want to go down the route of elibach as I'm sure I'd be scraping the inner arches more often then!