Get a stiffer spring. Go to TSC and get (I think) a number 175 spring. A little stiffer and a little shorter.
Another way is to grind some of the fly weights down so that they are lighter.
You can also work over the throttle linkage so that you can push the governor arm further and get the stop screw to touch.
Don't "wire" it or connect it solid. That's a real safety issue.