You're asking about the .204 system, but then say "I'm not panicking yet (still have about 100+ days until opening day), but I spent the offseason convincing myself to go to the X Impact and honestly can't stomach the thought of ordering another dozen". So are you trying to build new Rampages and scrapping your plans of using your X-impacts?
I wasn't a fan of the Rampages and IMO those micro shafts create more problems than they solve. But to answer your question, I wouldn't expect the aluminum Ethics system to hold up well. I do have some 100gr SS Ethics halfouts in a few RIP TKO's that are holding up surprisingly well, but historically I haven't liked ANY halfouts or outserts. I'm also too OCD to use collars, but if Rampages were my only choice........I'd have to use a collar.