This is a very good strategy, I am currently using this myself. The stab, and a use of leach seed is very good imporvement for this type of set up.
You can also do the same with other moves, like a golurk can use hammer arm, this will lower his speed, making gyro ball more powerful.
Make sure you have a good non-gyro ball move along with this set up becuase of taunt, and other variables that will ruin your run.
I hope this helps if you are going to use another gyro ball user :)