On Cerberus I've seen several players with +4(or higher) and + BLU skill... so it is possible. Rare. But possible. Funny that I've not seen any epic augments on anyone with a 'western' name.
+6 STR is what I use... I've only gotten +BLU once and it wasn't much and paired up w/ something useless.
BLU skill on those Udated now by Relic+2 Feet and/or Augmented Wyrmal Feets from Sky.
Also i ever had a BLU skil+3 MAB+2. Think BLU skill+3 is capp.
I am currently using a STR+6 and MAB+1 after up to 300 trades.
Wish STR6 + BLU Skill would exist <.<