I would probably go ahead and push the A times. 1 NW at this age isn't uncommon, but pushing A times could help with the EWs and naps getting too short. You might start to find the day getting long with longer A times and longer naps, some need to push BT back a bit. Average A times for 8 months is usually somewhere between 3-3.5hrs, so maybe even try an extra 15mins and see what happens and go from there.