The only way to get a perf roll is to ID the item, whether it be Anni or Griffs or any other item. Except for stupid items like Shako where you dont need to ID
For your next Unid/ID trip I would suggedt you ask yourself :
Do I want game/RNG thrills ?
Or do I want a consistent source of FG making ?
Do you want to play D2 or JSP ?
Note that going down the ID road you can still get your perf or near perf roll and beat the Unid path, but if market is balanced Unid should always be more lucrative than ID'ing.