Do you have any tips Kuga?

So far i'm running the trail LaserBack behind an Atlas or other Assault mech to provide damage support,i usually fire my Alpha where the enemy took the most damage.

Almost have 5Mil,have to save up to 8Mil so i can buy the JM-DD.

The Twin AC/20 seem quite dangerous.

I keep hearing on the forums not to use the Guess because it was nerfed,what part of it was nerfed?