Creeper Data not reflecting status

scoreboard players set @e[type=Creeper] creeper 1

{Fuse:1s}

is my command block code, this is meant to detect creepers at 1 tick before explode, this command does not work
Fuse:30s WORKS but every other number never gets activated, i have tried 1-5 or 20, the Fuse data for Creeper STAYS at 30 always

please fix so i can turn my creepers at spawn into fireworks :]