so my springs are way too stiff?
If that chart is relevant, and I think it is, you may find your 95/250 too stiff. The 95 part is livable, but the 250 part would be essentially a solid spring. So your tolerable wheel travel is limited.
I run a 95/140 on my CB750. This is slightly stiff for solo riding, on the softest pre-load. I compromise as I often take a passenger and/or a load. I'm about 175lbs suited up. With the passenger and saddlebags and stuff on the rack, it was full pre-load.
On a 500/550, I'd think you'd want a 75 to 85 on the soft part and no more than 130 on the heavy part. Depends on your weight, anticipated load, and riding style.
Go ahead and run them and see. A simple shock spring compressor can be had, and springs can be swapped out easily. The springs listed on that chaart have probably been updated to newer combos, which will require a phone call to determine.