Repositioning a player model's body parts?

Hi!

Today I was making a script that makes your character model grow in size before shrinking back to its base size. My issue is with the position of the body parts after the size change occurs.

To prevent the joints from breaking I've cloned the player's character and all of it's children to a model that grows in size before taking the place of your character for several seconds before switching back. I've tested the model before making it grow in size and its body part are all perfectly positioned like a normal character model. But when the model's size has been tampered with, this happens: http://prntscr.com/cwa8c4. The player's body parts become compact, no animation occurs, and the model simply becomes a "levitating meat cube"

I've tried changing the position of the character's body parts with Vector3, but the changes don't stay, and if I attempt position the head, the player will die instantly, because the head weld will break.

Here's the function that sets the player's size:

function setSize (char, value) 
    for _, child in pairs(char:GetChildren()) do
        if child:IsA("Hat") and child:FindFirstChild("Handle") then
            child = child.Handle 
        elseif child:IsA("BasePart") then
            child.Size = child.Size + Vector3.new(value, value, value)
        end
    end
end

And here's the code used to do all of the other work:

local enabled = true 

local click = Instance.new('ClickDetector')
click.Parent = giantPart

click.MouseClick:connect(function(hit)
    local char = hit.Character
    local player = game.Players:GetPlayerFromCharacter(char)
    local cenable = true
    if char and cenable then
        char.Archivable = true
        local m = char:Clone()
        if m then
            cenable = false
            local head = char:FindFirstChild("Head")
            local face = head:FindFirstChild("face")
            if enabled and head and game.Players:GetPlayerFromCharacter(char) and m then
            enabled = false
            setSize(m, 5)
            m.Parent = game.workspace
            player.Character = m
            if player.Character == m then
                game.workspace.Camera.CameraSubject = player.Character
                game.workspace.Camera.CameraType = "Custom"
            end
            wait(5)
            char.Parent = game.workspace
            char.Parent = player.Character
            player.Character = char
            char.Parent = game.workspace
            char:MoveTo(player.Character.Torso.Position)
            m:Destroy()
            if player.Character == char then
                game.workspace.Camera.CameraSubject = player.Character
                game.workspace.Camera.CameraType = "Custom"
            end
            wait(2)
            enabled = true
            cenable = true
        end
        end 
    end 
end)

What I want to know is why this is happens, and hopefully how to fix it.

Please keep in mind that the player's character model has been replaced with a cloned model that's size has been changed to the value input.

Thanks!