@Capsu1, I followed your suggestion and basically the results are better.
Regarding that piece of your quote.
As I was testing it out while I’m holding down the forward key or W, when I rotate the camera with the mouse and let go, I see numbers on the Y-axis but eventually it falls down to zero and of course X-axis is 600.
Overall I’m satisfied with the results so thanks for the help.
PS: If you still think that this can be further refined and you come up with something better, I look forward to testing it out. Now onto other matters in UE4.