As it stands, with a macro or even with simple timing practice, the UAC/5 way outperforms the AC/5 and is always the better choice if you can fit it; and one crit slot and one ton isn't generally going to 'break the bank' if you're planning on taking them anyway.
When using Smurfy's handy page, it's quite easy to see that the UAC/5 has roughly 50% more DPS than a regular AC/5. To me that pretty much demonstrates that the UAC/5 just about obsoletes the AC/5 and I think that this change would help to make the AC/5 a more competitive weapon.
edit: Changed the title to represent feedback, although I don't know if that's even necessary anymore lol.
Edited by TopDawg, 24 December 2012 - 12:11 PM.