How can I make the soldier rocket jump higher with the mantreads?

[FateFighter970730]

I'm using this config for it, but it's not working.

"444"
	{
    	"attributes"	"58 ; 1.5"
		"custom"
		{
			"damage vs bosses"		"3.0"
			"primary damage vs bosses"	"1.25"
			"melee damage vs bosses"	"1.25"
		}
	}