So, Primal Fury looks like a Boon and you're trying to bootstrap a class special ability to it. HL expects class specials to be bootstrapped only to Custom Abilities - which pass on the xLevel values to their bootstraps.
You'll want to recreate the class special Reckless Attack as a racial special or somthing to fake it into working.
As far as advantage on saves/skills goes I've never seen it done with a Helper.Advantage. Usually to get the * by the skill/save it's something like:
#situational[hero.child[svSTR], "You have advantage to STR saves.", field[thingname].text]
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