AKA Rattlers
https://robertsspaceindustries.com/electronic-access/Weapon-Roms/Rattler-II
I've had several of the same kinds of wake-up calls recently. Go into the public Battle Royal or Squadron Battles, and you'll see players that go 10-0 or more, while the rest of the players barely have a 1:1 kill/death ratio.
There isn't one set build that works for everyone, but getting the right load-out is as equally important as is learning how to fly.
If you want to get a good idea of what the current 'meta' is, just check the leaderboards. [RS] actually pulls down the leaderboard data into a spreadsheet:
https://docs.google.com/spreadsheets/d/1pFH-KPh9mqHqNliOl0on8oU2297unctmHCyXL7cSpj4/edit#gid=1007337434
Super Hornet and Sabre dominate the top of the charts, and most everyone uses the same sets of weapons:
Pew Pews (lasers):
Klaus & Werner CF-227 Panther Repeater
M4A Laser Cannon
M3A Laser Cannon
Ballistics (shorter range, overheat quicly, but pack a punch):
11-Series Broadsword
Tarantula 870 - Mk2
Try to stick with the same type of weapons as much as possible. Mixing and matching different types makes it hard to use because they fire at different positions and speeds.
Gimbled vs Fixed
Obviously, fixed weapons are going to hit much harder, because they're always 1-2 sizes larger. If you want to really do some damage, you're going to have to learn to fly fixed. However, a good gimbled setup will help you land more of your shots, and I still recommend gimbals for beginners.
Just equipping Broadswords doesn't make you leet though... you actually have to spend a lot of time learning to how use them effectively.
The important thing is to just start trying different loadouts. You can read 100 forum posts, or watch 100 videos, but until you actually equip the things, and give them a try, you won't know if they work for your personal playstyle or not.
And don't forget to equip ammo if you put ballistics on :D