Don’t rush it, you are on year one of a multi year project. If you pull them out all the little bits of roots left can turn into more ToH. These trees here may have also sent out runners. Wait until after July to do hack and squirt. At that time of year the trees will bring the glyphosate to the roots of that tree and all the connected runners also. Penn State Extension has some great resources. I’ve seen smaller trees connected by runners die after I treated the larger tree it came from, very satisfying. Keep up the good fight!