TTT Jumppack on pointshop

[CortexTTT]

Hello I wanted to know how to edit the jumppack on ttt pointshop so i can make it go higher and faster
this is the code right now

ITEM.Name = 'Jump Pack'
ITEM.Price = 15000
ITEM.Model = 'models/xqm/jetengine.mdl'
ITEM.Bone = 'ValveBiped.Bip01_Spine2'

function ITEM:OnEquip(ply, modifications)
ply:PS_AddClientsideModel(self.ID)
end

function ITEM:OnHolster(ply)
ply:PS_RemoveClientsideModel(self.ID)
end

function ITEM:ModifyClientsideModel(ply, model, pos, ang)
model:SetModelScale(0.5, 0)
pos = pos + (ang:Right() * 7) + (ang:Forward() * 6)

return model, pos, ang
end

function ITEM:Think(ply, modifications)
if ply:KeyDown(IN_JUMP) then
ply:SetVelocity(ply:GetUp() * 6)
end
end

help please, Thanks

[Aeternal]

Change the GetUp to * 15 and lower the gravity to 500 or so.