I do not under stand the concept of a dedicated medic. All my units have med kit in their backpacks. I'd rather kill the enemy before they can do more damage instead of dragging a fight out. I travel in packs, If I have too, I move two units to cover and commence with the dispensing of band-aids.
Barring some other tactic being more adventitious(setting up a kill zone at long range, or flanking the alien's hiding place from behind with some plasma grenade love.) I pray on the alien weapon's weakness, long range combat. Outside a partial weapon, even then only then in good hands, the alien's can't hit the broad side of a barn if they haven't planted their face in it.
Weapon load outs? I split between a one:one ratio of heavy lasers and bolt rifles ASAP(ignoring the alien guns completely). The lasers have the range and accuracy to shoot across the map with a fair margin of stopping power. Even between builds the bolt rifles are excellent weapons, and are lethal at medium to close range. They also have some long range power. I use lasers to lock down area's of the map or setup long range kill zones from some distance away. Baring a partial weapon, even then only in good hands, the alien's weapons medium to long range capabilities are laughable! I have no problems picking them off or locking them down to take them out at my pleasure.
General procedure? I respect the uses of different weapons, I don't brake my units up in set patterns. Every tool has it's place, and every place has it's tool. I lock down sections of the map, sweep it clean, and move on careful to never expose a area I've already cleared to the aliens. Sounds hard, but it's not. When you run into a new map, just plan ahead and think it though.
If it's a large open area, I'll post the heavy lasers up somewhere high. Trusting them to keep the aliens from hopping from cover to cover without at least being spotted. Then use the bolt rifles to pick the place clean.