With the rep ranges your training in you would still be focusing on hypertrophy moreso than anything else though. And if you modify your diet to prevent yourself from getting bigger, the strength gains are going to be harder to achieve as well.
Having said that if you change to a more powerlifting/strength based workout thats not going to mean you wont get bigger. Look at the size of all the strong guys markos post videos of, they aren't small by any stretch...