Launderess-- Yes, you did, my dear! As Nellie's has no brighteners, it may simply be a case of the whites looking "normal" without the gleaming boost of Tide's chemical cocktail. Don't want to invest in STPP, so will use the remaining Nellie's nuggets on various loads and be done with it.
If only P&G would make a detergent that rinses so wonderfully! Not a trace of suds in the final rinse, even with mechanically softened water.