Help with changing muscle position relative to the maxed out muscle

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#1

I want the muscles to gradually change, getting closer to the best possible physique. But I can’t figure out how to get the position to slowly change with it since I’m using a StartingPhysique and a MaxPhysique to be reference points on progress. Instead the muscle moves by like .1 studs to the side regardless of how much i increase the strength

local char = script.Parent
local plr = GetPlayerFromCharacter(char)
local MuscleFunctions = require(game.ReplicatedStorage.MuscleFunctions)
local MaxPhysique = game.ServerStorage.MaxPhysique
local StarterPhysique = game.ServerStorage.StarterPhysique
local SizeCurveMultiplier = script:GetAttribute('SizeCurveMultiplier')
local MaxMuscleMass = script:GetAttribute('MaxMuscleMass')

function IncreaseStrength(musclePart, change) -- lets say max muscle is 10000
	local MMPart = MuscleFunctions.Find_Muscle_fromModel(MaxPhysique,musclePart)
	local SMPart = MuscleFunctions.Find_Muscle_fromModel(StarterPhysique,musclePart)
	local muscle = MuscleFunctions.Find_Muscle_fromFolder(plr,musclePart)
	
	muscle.Value += change
	
	local progress = math.min(muscle.Value/MaxMuscleMass,1)
	local newSize = SMPart.Size + (MMPart.Size - SMPart.Size) * progress
	musclePart.Size = newSize

	local newPosition = musclePart.Position + (MMPart.Position - SMPart.Position) * progress 
	musclePart.Position = newPosition -- Here is the issue
end

while true do
	IncreaseStrength(char.Upperbody.Pecs.LeftPec, 5000)
	IncreaseStrength(char.Upperbody.Pecs.RightPec, 5000)
	
	wait(2)
end