Wow 3 shells? :Facepalm:
Wouldnt increasing the shells for barrage and lowering the Rof for Auto attack make this unit a really good example of asymmetrical balance? Low range, slow auto attack but huge range and good barrage ability with good AoE compared to fast/high range auto attack with less AoE?
IIRC both auto attack and barrage are equal till vet2, where the barrage get's insane damage boost. I'll go with an increase on number of shells on normal barrage to 6 leaving the long cooldown as it is. The other option is to reduce the barrage cooldown to 30s (this would reward micro way more).