The cooldown also hurts even more, stone tankers, who have that -rech debuff.
Instead i would surmise for combat tp, give it that small def buff, lose the to hit buff, get rid of the cooldown, and have it cost zero end, but each time you use it creates a short duration debuff to recovery like 5%, that lasts for 5 seconds and stacks up to 5 times or something. That way it will still somewhat put off people from using it as a straight travel, but not cost too much end while using it in combat.
Or you know, just get rid of the cooldown...