Not quite secrets, but I can give my general feedback, as I've started using them again today.

Overall, they're very effective when in their optimal range. However, I think the optimal is too specific to be practical. Lasers would be more practical if the optimal range was expanded 5-10m in both directions.

Also, the increase in feedback damage over tiers is unnecessary, 2 things could be changed about this. Either remove the increase in damage altogether, or incorporate the heat indicator as part of the sight, so it isn't so easy to overheat.

Depends on the game mode. Manus peak domination is very anti-laser.

Which suit are you using? Sorry can't see video now.

-XOXO

Depending on the map, my roles can vary from point defense to mid-range suppressive fire. It's really all about positioning, and what gives you the greatest advantage
Given that it's a mid-range weapon, the ranges for positioning would be ~40-80m from targets. Continuously watching the team and how the flank is forming and setting up a position behind that flank to act as either point defense or you can take on a more active role and move around acting with suppressive fire and anti-infantry. Taking advantages of high ground such as rooftops, table tops, high areas with walls so you aren't exposed are the greatest areas to setup.

Secrets? I guess one is I don't do the folk lore 'preheating' to increase damage on targets before putting the laser on them. The sound of a laser rifle is very loud and gives away positions quickly. I have never noticed a difference in damage from not pre-heating and pre-heating. What seems to matter most is the range you are at.

Success stories? On most games since I've perfected my strategy, I rarely die(0-2 deaths a game), and nab between 8-20 kills a game with it. This includes PC matches too. Though in PC matches my deaths increase since the game is more fast pace and flanks change in a moments notice.
Another success story is I can melt proto forge guns in 2 seconds. That's before they can even get their charged shot off.

If you want, you can squad up with me sometime and I can show you.

Note: You also stated you have to get your skills in prof for this to be a effective weapon. This is highly incorrect. I was doing those scores with a adv laser rifle with LR 3. Prof makes this weapon better 10 fold, but saying you MUST have prof skills is wrong. I mainly use adv laser rifles in pub matches with great success.

What color should the beam be? Physics wise. Maybe the color can change from when you first fire to a hotter color, when you near max damage.

Why should there be race specific colors on a race specific weapon? Makes no sense