I was on a 4 day trip last summer that included Farnsworth. The ocean was lake flat from SB Island to Catalina, weather was perfect 75 degrees, not a wisp of wind. Got to the pinnacle and there was about a 4 knot current raging. So we dove the backside and were to try again the next day. Same conditions. So even when the surface conditions are great, what's down below can be much different. I am 2 for 6 on Farnsworth trips. I think thats what makes it sort of a Grail Quest. You just never know.
I will mention that instead of Farnsworth the 2nd day we did dive with more Giant Sea Bass than I have ever seen in one spot. So there was an upside.