Run the other 4 back on to hold the wheel tight. Get the bad boy off before removing the others.
This will help. Loosening the others will put more pressure on the stuck one. Tightening the others will bring it back to normal.
Also...a 3/4 socket is 19.05mm so just a tad big. Add in machining tolerances and you may be .1 or .2 mm big so better to get a real 19mm.