You can't spam it constantly. Ok, zone into exp zone meditate. Up to 60% tp. Assuming you have to walk to your exp camp, you will get up to 120% tp before the fight. Fight starts, penta. Now you have 60 TP again. Meditate again, 120tp...penta thrust, jump jump hit hit penta thrust.
Ok sweet you just did 3 penta thrust's on a mob. Too bad that mob just gained an insane amount of TP only to do about 1,000 damage....which is no more then a single SA impulse drive would do :/
http://img130.echo.cx/img130/8392/10003et.jpg
XI Wiki

