We put the blue sumo springs in our 2917 Tacoma and they did not make it feel harsher. The Sumo springs come in different weight carrying capacities (are color coded) and the black ones may cause harshness. The blue version made the suspension feel firmer, but not harsh at all.
How did you get the 2917 model so quick? Scotty, Scotty are you really out there? Beaming up!
I've had the blue Sumo springs on a 2016 Tacoma Off Road for about 1 1/2 years. Unloaded, they have little or no effect unless you hit a bump big enough to bring them into contact (They ride about 5/8" from the spring). You lose the advantage of the smooth long throw suspension of the Off Road model - it gets stiffer as it compresses the spring) but I prefer it to the air shocks (hard to be sure since the air shocks were on a RAV4 towing a 17). Certainly less hassles.
Loaded with a fiberglass topper & a 21 tongue weight, they limit the drop, and suspension travel, but the ride is not at all harsh. Their effect is gradual, increasing with added weight.
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