I have a Glock 21 45 ACP with Factory Threaded Barrel, Factory Suppressor Sights and Factory Springs. I took it to the range to shoot my new AAC TiRant. I was shooting 230 gr Winchester White Box. The gun never went back into battery once after firing. The gun would cycle and almost go into battery. All I had to do was push a little on the back dust cover. What spring weight should I change the Factory Springs to such that the rounds will cycle?