The set bonus of the Battlelord Set doesn't seem to increase the damage of Warg Strike nor Blitz Beat. It seem that only the stats it provides adds bonus damage but not the set itself.
Here's some pictures from testing: (I tested on Dark Kobold Archers in gld2_prt)
1) Blitz Beat with Battlelord Set:
2) Blitz Beat without Battlelord Set:
The only bonuses that I assume are being accounted for are the stat bonuses from the armor. Upon taking off the armor, I lost 8 points of Dex (idk why not 7), Agi, and Vit. The set is supposed to grant me a total of 12.5% additional damage with Blitz Beat but I don't seem to notice it.
3) Warg Strike with Battlelord set:
4) Warg Strike without Battlelord Set: