I saved all the time I possibly could from my old record, skipping any Red Focus strats and coming up with some new ideas. Viper has lots of little tricks so I might have missed a speed strat somewhere, but I have a feeling that sub 5 minutes is practically impossible. The main reason I even decided to try this one again is that I found some execution shortcuts that make a lot of her difficult trials much simpler than they seem.
I got the U1 animation skip on Trial 5, and also found a new way to do the same thing on Trial 20 (imo it's also easier than doing the trial the intended way). I saved time on Trials 14 and 23 by doing the Super Jump cancel directly into U2 instead of cheesing it with EX Seismo or Red Focus. On Trial 17, I saved 0.3 seconds by starting with 6 dashes instead of my old Red Focus midscreen strat, but it's much harder to time the U1 juggle.