I agree with upndown. Try this to test your springs if you have not already.
Pull the disconnect rope on the opener so that you can operate the door manually.
Close the door, and then open it up about half way. It is hard to open? Can you do it with one hand?
Open the door about half way. If you let go of the door when it is half way up, it should stay there and not slam back down or go fully up. If you have the correct springs on the door it should be fairly easy to open, and the door should stay in place when you open it up about half way. It might creep up or down from the half way point, and that is ok. But it should not slam back down or go flying fully open.
If after opening the door half way it wants to slam back down when you let go of it, then the springs you have are too weak and they should be replaced with the proper springs for the weight of your door.
If after opening the door half way it wants to keep going fully up and open really fast, then the springs you have are too strong, and they are made for a heavier door than you have.
Both of these situations can cause problems with the operation of the door. The weaker springs would cause the door to stop on the way up, and the heavier springs would cause the door to stop on the way down.
Jim