I think trying to beat Zico now would be a lot less challenging than before the update. The thing that really p1ssed me off before was that you could only try and do it every other lap which meant hundreds of pointless laps round AP. At least since the update you can cancel your boost and save it for the end of each lap. The other thing that annoyed me was it was venom class - i'd have much preferred any other speed class for this one particularly on AP as zone zeus is (pretty much) only achievable on AP, or is definitely easier on this track.
With Zeus it was a much more gradual progression towards the trophy. Each time you got a higher zone or super zen, subsonic, mach1, zone 70, you knew it was possible to do and its so satisfying when you finally hit zone 75.