I didn't replace the springs...didn't read anywhere that they needed to be replaced. The nailing wasn't too bad after I did the o-rings. I read that crush washers would set in over time as you stated. It's just that the sound is louder now since I did the nozzles. The cold idle is rough, and the smoking doesn't dissipate after it warms up. Not bad, but it's there. I didn't rotate anything below the washer. The springs might have moved a little side to side, but that's it.

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1990 300D 2.5
1991 F350 7.3 Dually IDI

1997 F350 gasser dump
1980 H-D 93 inch Shovel
2000 SE Roadglide