Thanks man Hopefully it will be of interesting use for fellow owners.

Here's some tricks I found regarding the lock up:

1) The lock up engages based on engine load. If you are putting a lot of demand at that moment on the engine, the lock up will not likely occur.

2) Likewise, when you are undergoing very light engine load, the torque converter will more likely lock up

Hence, I try to keep my feet light on the throttle unless necessary and most of the time the torque converter locks up.

However, here's also another trick to lock it up. If you find that it's no locked up, just tap the accelerator lightly, give it a short amount of distance with light foot. It should lock up