Sorry to hear you have a hard time in Depot A with the build. It's the part that annoyed me the most, too, with this specific char, as I wanted to use Laser as much as possible, but it did hurt a bit here.
In general, as all the experienced posters before mentioned: try to get as much done outside to level up. I usually even try for Abram's Maura quest etc. Playing only on experience, not oddity, so I don't really know how much you could do.
Meta helps as well: for instance, the dog maps usually have good choke points (the one with the turrets has the control room door, lure all dogs there, open, force field, wait, grenade, close, repeat; the old trick really takes the edge off). Many other groups also can be put into choke points with doors, where two or three bear traps help with CC.
As said above, with Critical Power LPs become powerful (Sharpshooter, Blindsiding, Opportunist around that level mitigate the fact that you cannot craft the best Amplifiers yet), before you have to rely on nets, traps, nades, and all and finish the trapped enemies off with a far from powerful laser pistol. Things get much chillier after Depot A, but tbh Depot A is really a bit of a spike.
Crafting on this char is the biggest disappointment for people playing higher INT characters (that and lack of Premeditation). You can really wait a bit. To give you a sense: I did level only Electronics below Lv10 on a regular basis. On Lv10 I had Elec 45, Chem 30 and Mech 25. It's not a crafter. Later on, Bio 20 for Gas Grenades, more Electronics, but INT 3 always means you are late to any crafting party and will want to rush the housing bonus.
Hope this helps a bit. I can post more damage numbers on different levels from my OCD excel sheet if that is of interest
EDIT to add: The one thing I always crafted whenever money and parts allowed was a new laser pistol with the best amplifier I could put into. You cannot find laser pistols with higher crit damage bonus than 100.