Lowering springs = can’t use bump stop?

Edit: title should read “snubber...”

So I installed my new rear axle/suspension with Hotchkis lowering springs. While the car isn’t even sitting as low as it did with the old 7.25” and old/sagging(?) stock springs, it looks like it’s still low enough that my Mancini Bump stop ain’t gonna work.

Even adjusted all the way down, the rubber is touching the contact point.

So did I screw something up?

FWIW, the springs SEEM too stiff. I haven’t driven it yet but I’m not able to compress the suspension all that much even by pushing hard on the bumper. I was expecting them to be firm but this surprised me. This is what prompted me to check on the bump stop...but it feels about the same even after removing it!

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