A peculiar problem with animation?

I have this issue with my animation system, in which I am forced to either allow the animations to play infinitely, or allow them to jolt and glitch.

Let me explain

I added line 44 in an attempt to stop the update rolled out by ROBLOX which broke all animations and as a result was said to be disregarded by the OP. See the link here http://devforum.roblox.com/t/animation-optimization-fixes/25450/2

However, with that line in firing, the animations jolt before playing in a very obnoxious way. See here https://gyazo.com/eb3898db20a74a07fe2de35bdaac2d7b

But if I remove this line, the animations seem to play non stop, disregarding the idle animation.

I'm stuck between a rock and a hard place and I could use a hand. Thanks in advance!

--Player Variables--
local Left = Instance.new("Animation")
    Left.AnimationId = "rbxassetid://416628708"
    local Right = Instance.new("Animation")
    Right.AnimationId = "rbxassetid://416628708"
    local Forward = Instance.new("Animation")
    Forward.AnimationId = "rbxassetid://416928312"
    local Backward = Instance.new("Animation")
    Backward.AnimationId = "rbxassetid://416928338"
    local Jump = Instance.new("Animation")
    Jump.AnimationId = "rbxassetid://408621791"
    local Idle = Instance.new("Animation")
    Idle.AnimationId = "rbxassetid://416928266"

    local already_ran = false
    local grounded = false
    local State = false
    local RunningDebounce = false
local P = game:GetService('Players').LocalPlayer
repeat wait() until P.Character
local Inputs = {Left,Right,Forward,Backward,Jump,Idle}
local Event = game.ReplicatedStorage.Events:WaitForChild("AnimationEvent")      
local Value


function onKeyPress(inputObject, gameProcessedEvent)
    --if State == true then

    if inputObject.KeyCode == Enum.KeyCode.A then
        Value = Inputs[1]
            elseif inputObject.KeyCode == Enum.KeyCode.D then
        Value = Inputs[2]
            elseif  inputObject.KeyCode == Enum.KeyCode.W then
        Value = Inputs[3]
            elseif  inputObject.KeyCode == Enum.KeyCode.S then
        Value = Inputs[4]
            elseif  inputObject.KeyCode == Enum.KeyCode.Space then
        Value = Inputs[5]

    end
end

            game:GetService("UserInputService").InputBegan:connect(onKeyPress)

    P.Character.Humanoid.Running:connect(function(speed)
            for _,v in pairs(P.Character.Humanoid:GetPlayingAnimationTracks()) do v:Stop(0) end
        if speed < 1 then
            local AnimTrack = P.Character.Humanoid:LoadAnimation(Idle)
                AnimTrack:Stop()
                wait(.01)
                AnimTrack:Play()
                    print("Idle and Awaiting Input")

        elseif speed > 0 and RunningDebounce == false then
                 RunningDebounce = true
                    local AnimTrack = P.Character.Humanoid:LoadAnimation(Value)
                        AnimTrack:Stop()
                        wait(.01)
                        AnimTrack:Play()
                print("Moving")
            RunningDebounce = false
        end
end)