The Research is good and gives you many posibilitys to get your first Upgrades.
But I agree with you to upgrade not so fast with Alien-Tech (like the Alien Alloys). There should be a Step between used Human Tech and Alien Tech. You can upgreade Human Materials with lightweight Materials and much more Protection against Bullets. You can upgarde your old Cevlar Vests to Spider Silk Vests. The Idea isn´t new and get testet in the Industry. Spider Silk is lighter then Cevlar, gives a little more Protection and is more flexible then Cevlar. One more Thing is speaking for it to. It´s harder then Steal, which can be an protection Upgrade for the Aircrafts and your Transports too.
And you could create a new Fighter / Transport as a Intermediate Step on that Material, like the Racining Cars which uses not erverydays Material in special Area.
The Idea with the new Tungsteen bullets are cool too. That could be combined with the Alien-Magnatic Technology. For that you reduce 1 normal Alien Weapon which are mostly in your Storage (like Pistols, Rifles). After you have done the Upgrade for your Standard-Weapons incl. the Aircraftgun to that new Standard, which are not fully Gauss Weapons, the best Weapenupgrade for normal Guns are done.
For fully Gauss Weapons or Coil Guns you need the Alien Alloys like in the Game involved. But not only, you have to interrogate Soldier Aliens and Technicans for more advanced Research of the Alien Magnetic Weapons. That´s the higest Ballistic Weapons you can build for your Soldiers and for the founding States. Coil Guns use Ammonation from Alien Allios, which are harder and more effective like Tungsteen and are build up from the full Magnetic-Alien-Weapon-Technology.
Laser Weapons are the next Upgrade-Step like now in the Game. They are more effective than the upgraded Standard-Weapons about the high burning Laser Beam, but not so effective like the Gauss Weapons. For the Laser-Technology you need Advanced Ballistics, advanced Safty-Materials (Spider Skil Vests and Armor), Research of Laser Weapon Documents from the founding States and Laserweapon-Prototyps from founding States, which are worked on them.
You can upgrade them later to a better Variant, which have a little bit more firepower with new knowledge of the Alien-Power-Tech and Materials. That Weapons can be called Laser Weapons Mk II or similar. They are still under the Power from Coil Guns, because of Safety-First-Device. After that the Gauss Weapons or Coil Guns get availible after the requirements are done.
Plasma Weapons you can research at last, after you have done all interrogations, prevouis Weapon-Techs, prevoius Armor Techs and so on. After that you can upgrade your existing Laser Weapons Mk II to Plasma Weapons and build new ones. Plasma Weapons require all the Knowledge you can get from Interrogation, Laser-Weapon-Research, fully Alien-Plasma-Weapon-Reserach and Power as well as Materials from the Aliens.