Sounds ok,e you've been turning the wrong adjustment screws and you're not really aware of how they work. The screws in the arc-shaped slots control the door travel limits. One tells the door when to stop when it goes down, the ore when it goes up. If the down limit is set to let the door travel too far, the door hits, wants to keep going but can't, so it auto reverses. The vertical row of buttons to the right of the arc slots control open force, close force, learn code. It would be better to have someone local that is familiar with openers to stop by and set the various adjustments. It only takes a few minutes.
As far as the company that replaced the springs goes, if the springs are the correct weight for the door, and the opener worked properly before hand, they wouldn't necessarily readjust the open or close force. They should make sure the door travels up and down correctly before they leave. I usually cycle the door 4 or 5 times after installing new springs. I am checking to make sure the door seats as best it can. I also check to see where the door stops in the up position. Many times they travel too far, to the point where you're not gaining any additional clearance underneath, but you are taking more tension off the springs and possibly causing a bit of slack in the cables.
Mike Hawkins