I had more luck with it on the named valdore. Green move with donotra had me rolling 2 sets of 4 dice. Only really works well against shielded ships,since the crits ccircumvent the shields.
That doesn't work, though. If you use it on the Valdore, you only get the +1 from its ability once (so on the first attack) because it says you add one die this round. That means total, not each attack. However, if you used the Khazara, then it would work because its wording is different.