to be fair, rerolling for a 100% eido is madness ~~ if you get one in couple rerolls, be happy, take it, enjoy the game. i would not go out of my way to reroll till i get them, would most likely stop at a core hime + something useful, or some shit along those lines. i don't know anyone that actually did 2k rerolls without a 100% eido, but couple of friends did several hundred (<500 in total over the month's) without any 100% eidos. maybe 0.5% chance? no clue.

<--- did never rerolled, just played the game, had no clue what reroll was. If i had known, i would most likely have 2-3 good ssr himes more ~~ well, did start early on, did not lose out on much though, also sol's weapon loves me.

tl:dr if you have access to get one 100% eido, use it, be happy. you are done rerolling