How to make it more difficult though?
Just increasing the spread does not make it more difficult, it just reduces the effective range. There is close to 0% skill involved in how many pellets of an LBX swarm you land on target. Any difficulty is in aiming the swarm, but since you can not affect the spread itself with anything besides distance to target there is no skill involved beyond what you would find in aiming a laser (or rather a gauss, since that has more comparable projectile speed, and is also one hit rather then a beam that has to be held on target).
/Merf - LBX20, a bit boring, but good as far as game balance go.
increasing the spread would make it less of a bust through the armor weapon and more of a finisher. So while you don't directly increase the LBX 20 difficulty you force the player to use the secondary weapons to greater effect.
Now I honestly start shaking my head in disbelief.
Wolf, you play this game long enough, what was the LBX like in 0.2? Jup, by far more spread. What was the forum like? Jup, tighter spread is needed and blah.
I totally agree with MERF since he seems to be the only one who still remembers the 'old' LBX 20:
Increasing the spread just lowers the maximum range the weapon can be used in an effective way by far.
Will lead again to the same old 'ram the barrel in his ass and pull the trigger'.
Edit: You suggest some posts earlier to increase the damage per pellet... Ok, what will the damage output be like when fired point blank? One shot Assaults?!??!