applying balance stick

Stealth Tank damage vs. wood nerfed; a few stnks could quickly uncloak and destroy a building, e.g. refinery. 
Guard tower slight buff, to kill E3 in 2 shots instead of 3, and E4/E5 in 4 shots instead of 5.
E3 rockets expire a bit sooner. They would continue on forever. Their range is still long, but now it's possible for some units to escape.