I'm a huge fan of my vampire for anything 532 bolt face. If you're considering anything on the lapua bolt face, get the vesper. Of all the actions you posted, it's the only one with a 1-1/8" tenon and oversized lugs. I've owned a few the lightweight terminus, I'd pass after owing them. I do like my original helios serial number 0007, but the 2 newer ones I'm not impressed. I don't believe terminus has a modular bolt to swap faces. I'm not a defiance fan boy, but after I played with one that Alex Wheeler had gone through and cut the cocking ramp and timed the trigger to, it felt great, much better than an out the box deviant.