To be honest, Taffy is really good as it is. You underestimate it.
Unlike other food, it provides a percent-based recovery, so it'll scale with your level. None of the other items do that, and I won't make a good item even better just because certain people did farm the monsters that drop them a lot. Having stocked up on a recovery item that will stay relevant no matter your level should be reward enough. And Blue Taffy, giving you a +5 all stats buff, is pretty good by itself. That's more health, more mana, more attack, more dodge, more crit.
Though, I do like your suggestion of hybrid healing potions (that recover health and mana, though at a lower rate than a non-hybrid potion would). :3