Projectile velocity vector problem

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#1 

(line 1)    local angle = -15 
(line 2)    for i = 1,3 do
        local proj = game.ServerStorage.AsrielStuff.ChaosBusterBullet:Clone()
        local one = Instance.new("BodyForce",proj)
        one.Name = 'NOGRAV'
        one.Force = Vector3.new(0,proj:GetMass()*workspace.Gravity,0)

--(btw "ChaosBuster.poss" is the part with green cone ( to show where it points to ) )

(line 7)    proj.CFrame = script.Parent.ChaosBuster.poss.CFrame:ToWorldSpace(CFrame.Angles(math.rad(90),math.rad(0),math.rad(angle)))
(line 8)        proj.Velocity = proj.CFrame.YVector * 40
        proj.Parent = workspace
(line 10) angle -= 15
            end

take an attention on these lines i marked.

i was trying to make projectiles shooting that will rotate (will look down) and it will move by using Y vector (moving it forward by using that vector), but for some reason it moving in a wrong way, meanwhile it must move to where green cone points to