We don't do fascia iliaca blocks for hip scopes unless the patient is in intractable amounts of pain in the PACU. I was just talking to one of our most active orthopods about this the other day...hip scopes are one of those weird procedures where some patients cruise through it with minimal postoperative pain, whereas others are in dire straits.
For THAs, ORIFs in little old ladies, and for the hip scopes that I do end up blocking, I usually use 30 mL of 0.2% ropivacaine. The lower concentration used and ropivacaine having slightly more motor nerve sparing versus bupivacaine lead to patients being able to ambulate day of surgery (obviously with assistance).
Also, out of curiosity, how are you doing your fascia iliaca blocks?