Spinning a GUI like a Pendulum?

(my first post)

I've been trying to make a image label spin like in that FNF Hypno's Lullaby mod, but when i try to do it, it looks hella ugly. Is there any way around this or making this not have this ugly tweening

function movePendelum() 
    task.spawn(function()
        while true do
            local speed = script:GetAttribute("speed")
            task.wait(speed/2)
            TweenService:Create(Pendelum, TweenInfo.new(speed/2, Enum.EasingStyle.Circular, Enum.EasingDirection.InOut, 0, false, 0), {Position = UDim2.new(0.5, -118,0, -34),Rotation = 45}):Play()
            task.wait(speed/2)
            TweenService:Create(Pendelum, TweenInfo.new(speed/2, Enum.EasingStyle.Circular, Enum.EasingDirection.InOut, 0, false, 0), {Position = UDim2.new(0.5, 118,0, -34),Rotation = -45}):Play()
        end
    end)
end

video examples: https://vimeo.com/657963307 https://vimeo.com/657964424