Listen to this article Although the seven-time world champion topped the times on the final day of running, the three days of action have not been completely smooth for his Brackley-based team. In particular, Mercedes has battled the porpoising phenomena that most teams have faced to a greater or lesser degree, and it still faces some work in trying to find a proper solution for the next test in Bahrain. Amid a consensus that Ferrari and McLaren have had the most positive of week of testing, Hamilton suggests that Mercedes has not had a perfect time. However, he says the reliability of the car has been good and he says Mercedes is steadily working through the work it needs to do. “It’s been an interesting few days,” he said. “It’s not been the easiest, or the most smooth running. We’ve definitely had some obstacles to overcome. “But we’ve got through a lot and of course we’d always want more laps, but I’m happy with today. I think I almost got 100 laps in today. So for half a day of running, that’s not too bad. “[We are] a little bit behind on the last two days. The car is a lot different to previous years to drive, as are the …