I was going to suggest a human-alien hybrid tech to give the Lasers a boost(unlimited/recharging ammo). I guess I could turn it around. Being the nerd I am, I dug up a old read on
Tokamaks. We can't get it to work yet for a lack of knowledge working with plasma... The Aliens demonstrated a intimate knowledge of the subject.
If I remember correctly they're coming here for hosts, and new ideas. Why not turn the tables, say they see what we've been doing, and turn around and reinvent our technology. Some time after we've deploy lasers, and they deploy partical weapons, have them roll out a super laser. They look at our lasers, and seeing it's a good idea, but we don't have the power to get it to work well. They do, they turn around replace the D-F carriage with something alien. Repaint the weapons blue, maybe tweak the model a little.
It is just a modification of our existing design so a supper stat boost isn't needed. Just turn around and say they made it more durable with local materials, and made the chemical laser a conventional one, and gave it a more powerful recharging power source, a mini-Tokamak. That way whatever changes given could be balanced by saying the new ammo type, wile recharging, burns out and cools off weather it's used or not after a few hours once started(a mission.).
Seeing the Aliens increased strength, maybe make a Alien laser cannon, only slightly less powerful then our craft mounted version, but man usesable. Able to cut a large swatch of destruction at range, but using the same power cell as the lesser versions. Using so much power to fire from a cell designed for something smaller, it has to recharge over a turn or two to fire again.
Edit:
Something else I forgot, Alien chemical grenades. Moddling, which I can't do right now(Doh!) wouldn't be more then a clear ball that splatters. They seem to like high energy physics, but what about chemical warfare? Why not a corrosive that is oxygen activated that sticks and super heats them.
