Ok, had a quick look at log. Definitely the same spike as me.
In the log, your hitting 28g/s fuel flow around 2850rpm. You're switching to normal flow around the 25-26g/s I suggested, but that's still too soon in this log.
Try setting low flow upper to 29g/s in 2800rpm and all the cells below make say 34g/s, above 2800rpm can stay stock. Change the low flow lower to match the 5g/s drop as mentioned before. Takes a bit of fine tuning to pick your spot when you want it to switch. If you make the cells below 2800rpm a high number, in winter/summer/all conditions the change to normal flow won't happen until 2800rpm or more. Same goes for cells above 2800rpm, if they're a lower number (like stock values), then as you pass 2800rpm the fuel requirement for the switch becomes less. Helpful in summer, and keeps everything centered around the 2800-2900rpm.
If want to switch even later, just look at your logs and work out how high you need the values before the switch, and how low you need the values after the rpm you want to switch. Basically choose an rpm, check multiple logs for fuel flow at that rpm, make numbers high before the rpm you want, and numbers low after rpm you want.
Also, majority of my tests are done in 4th gear, and WOT anywhere from 1200-2000rpm. Feel sorry for the clutch and engine, but really helps to see the lean spots and switching when they're unaffected by transient.
Unsure if 3rd gear WOT would have vastly different fuel flow, but just check your logs and choose a fuel flow and rpm above 2800.
Forgot to mention as well, I changed my Hot Fuel Soak and Hot Fuel Pressure to match the lower pressure.
Screenshots of all that's needed for the fuel switching and pressure, and also my openloop DC.
Attachment 136487