I'd definitely ditch all the Cleave feats. As you're already finding out, they're very situational, and may rarely come into play for you.
Instead, absolutely go with Arcane Strike as soon as you can cast spells. (Level 4 for a Bloodrager, so take that as your Level 5 feat.) It's a must-have for all arcane casters who primarily focus on using traditional melee/ranged weapons. As noted, it's basically free damage.
Weapon Focus and/or Furious Focus is another good choice for a spare feat on a Power Attack build, to help offset the Power Attack penalty.
And if you want to go the Cornugan Smash Intimidate/Demoralize route, then Intimidating Prowess and Hurtful are both good choice as well.
So I'd recommend something like this:
1: Power Attack
1B: Furious Focus, or Weapon Focus (Greatsword)
3: Intimidating Prowess
5: Arcane Strike
7: Cornugan Smash
And max out your Intimidate skill with a point every level.