I'd say ditch the adrenaline scaling since it is a one turn thing. The scaling is needed with adrenaline for balance since the creature is getting a permanent boost (can't even remove it with lobo unlike momentum). This is a 1 turn deal. It may give some OTK potential, but certainly no worse than dive and skyblitz. Because this is a single target, it fills a somewhat different niche than blitz too, since it will encourage use with a single large creature rather than bumping a large number of individual small ones.
I also think its sufficiently different from skyblitz since it is more vulnerable to shield and poison affects (like adrenaline).
Just a thought... why not just keep both having +1 attack, but give the upped version a 1 round momentum effect on the second attack?