Well, I got my answer... even though the account was created a year ago, it was used for games other than EQ1, so it fell under the "one per household" rule. That's why the one Bronze account could create a Heroic, but not the other two.
Seems to me they should honor a Sony account used to play their games, whether it be EQ1, EQ2, or whatever.
Anyway, glad to have the Heroic that I got. Perhaps this explanation will help others as well.
Tat
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Tatanka Wolfdancer, 115 Wood Elf Druid, 9 x 300+ Master Artisan, 7 maxed trophies (dang research! :)
Michone, 115 Troll Shadowknight
Anaceup Mysleeves, 115 Erudite Mage, 2 x 300 Master Artisan
Snookims Whinslow, 112 Erudite Enchanter, 2 x 300 Master Artisan
<Inisfree>, Tunare (Seventh Hammer!)