Don't have too much canyon experience but 2 summers ago we spent the night drifting away from the fleet near Tom's with the genny running all night long. We had unbelievable YFT action - after we boated 5 80 lb class tuna, arms were so sore we just fed them off the back of the boat - an amazing sight!! Seems to me that if the fish are there and you're feeding them, nothing short of some sharks coming through the area will scare them away. Good luck!!