Here's my current thinking; I'll also point out where I think it's lacking...
Assumptions:
* Heroic campaign
* Epee: 1d6 HKA, STR Min 10
* Character has STR 10
* Fencing Slash: +0 OCV, +2 DCV, +2DC Strike (note that +2DC with a Killing Attack weapon gives +1DC)
So what is wanted is a 3-shot Autofire attack with an epee that does 1d6+1 with a base damage of 1d6.
Fifth Edition
Flashing Blade 1d6+1 HKA (20); AF3 (+1/4) (25); OAF epee (-1), No STR Bonus (-1/2) (10) PLUS 2 5-point CSLs (10); OAF epee (-1) (5); total cost 15; END 2 per shot (no END for STR use)
Ultimate Martial Artist
1d6+1 = 20 base points
+2 DCV = 10 base points
total base points = 20+10 = 30
+1/4 Advantage on 30 points = 7
total cost 7; END 1 per shot plus 1 for 10 STR use
LACKING: The epee is a 1d6 HKA weapon and therefore can't do more than 2d6 HKA with all damage bonuses (from CSLs, velocity, Manuevers). Both examples above are 1d6+1 base damage and could go to 2-1/2d6. My best thought so far is to apply a Limitation on one of the DCs "Doesn't count as base damage" (-1/4???), but that feels clunky. There must be a better way!