Reviews/experience with front suspension spring?

I've been experiencing bottoming out on my 02 2500 with 15s, especially after putting koni reds in and carrying more load - I noticed during install that the new struts were about 2 inches taller- the part that houses the cylinder. I think with the sagging front end, less travel in struts and carrying a lot of weight up front (about 1500 lbs at sliding door area) I should consider a heavier spring than oem.
Does anybody have experience with the heavy duty spring the sprinter store sells? Should I fix this strut issue first?

Thanks, Jonathan

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