[Skytrooper]

As a former garage door installer/repairman I can tell you what needs to be done.
The issue you have is that garage door springs are matched to the weight of the door. Your new do it yourself door is way to heavy for the old doors springs.
Call your local garage door company....schedule an appointment for them to do the work. It will be quicker and safer than you can do it. I mean c'mon you have a Porsche, 150 bucks shouldnt break the bank like those springs will do to you.
I have seen the blood and gristle of too many do it yourselfer/youtube mechanics to not advocate for the trained professional.