I'm not the metal expert either but if you add a large amount of bleach and your pool does NOT turn green or some other color, but, instead, reacts as we normally expect with an algae bloom, you probably don't have serious metal problem.

When you do have a metal problem the metal remover first must dissolve and suspend the metal before you can raise your FC level--or it goes jello-green.

Have you posted the results of metal tests here? If you haven't done the tests, the local pool store can probably do that...they'll try to sell you stuff, including useless calcium for your VINYL pool--but you don't have to buy it.