It's not that Rage of Halone is significantly overpowered or over budget, but that Butcher's Block is significantly underpowered/underbudget.

As the end of a 3 skill chain combo it has no real secondary effect other than the class mechanic (wrath) and the very minor potency increase (20 difference from Rage). If you look at pretty much any other job, their "end of combo" skills all have some significant bonus. (with the exception of maybe Full Thrust).

Honestly Butcher's Block should have some secondary effect.

As a side note, if Butcher's Block reduced STR by 10% and Rage of Halone did nothing, the 2 jobs would be much closer to being balanced in terms of durability.