AlQuds is correct - you’re not alone in struggling with Reload generally, and Abyssal Dwarfs specifically. That feedback has made its way to the RC and I wouldn’t be surprised if there were some helpful tweaks in the next FAQ and Abyssal Dwarf releases.
Until then, consider a few tactics:
Create Kill Zones
Shooting is good at putting pressure on enemies. If the enemy sets up camp around a mid-table objective like Portal, you shoot the hell out of them until they die or deal with you. Alternatively, if you are defending in a scenario, you can set up just outside of places they need to go, so they have to enter your shooting zone and give you one free round to soften them up. This works especially well as a…
Second Wave
As salem notes, if you screen them you can put pressure on the enemy, forcing them to charge, move away, or let you shoot - with less risk for your shooter. (For more on charge blocking, see this post.) And if they do attack and kill a screen then you…
Counterattack
The Decimator does little until the mid-game when a big scrum forms. One of my models gets killed, leaving a bunch of victorious enemies all clumped together. Unload, hopefully hitting 3+ dudes in one blast, which makes up for not shooting the 2 previous turns.
Game the Initiative
A key part of getting around Reload is gaming the initiative so that at the end of the Round you have your shooter(s) in a good position for the next Round. If you made smart use of Group Activations and +1 Model Activations you’ll finish first and so go first the next turn. Shoot, and maybe use Fatigue to fall back.
Field More Blacksouls
But these are all gambits. As it stands right now, I think you’re right - more Blacksouls are the better investment.