Problem welding a model to a AI?

Someone in my project has made a model to replace with a basic AI. I've easily welded all the parts to a "torso" in the model, a centre part. However, whenever I attempt to weld this torso part to anything such as the HumanoidRootPart the AI will get very buggy. Glitching, teleporting, ect.

Details - All the parts inside the model have CanCollide set to false and none are anchored.

Here's the welding script..

torso = script.Parent:WaitForChild("Torso")

torso = script.Parent:WaitForChild("Torso")

for _,v in ipairs(script.Parent:GetDescendants()) do
    if v:IsA("Part") or v:IsA("UnionOperation") or v:IsA("WedgePart") then
        if v.Name ~= "Torso" then
            local weld = Instance.new("Weld")
            weld.Parent = v
            weld.Part0 = torso
            weld.Part1 = v 
            weld.C0 = torso.CFrame:inverse()
            weld.C1 = v.CFrame:inverse()
            v.CanCollide = false
            wait()
            v.Anchored = false
        elseif v.Name == "Torso" then
            local weld = Instance.new("Weld")
            weld.Parent = v
            weld.Part0 = script.Parent.Parent.RightHand
            weld.Part1 = v 
            weld.C0 = torso.CFrame:inverse()
            weld.C1 = v.CFrame:inverse()
        end
    end
end

Would appreciate any feedback possible :D