How far off shore are you guys going? I've done 60 mile off shore runs without issue but I'm headed where everyone else is headed for BFT. So many boats out there you have to be careful to not cut off someone else's lines (I let a buddy skipper my boat and he did that, lesson learned, run your own damn boat).
If I were going that far offshore and I knew it was likely I would be alone (A) I wouldn't do that and (B) then I'd want a raft.
I looked into the various rafts. They are all inshore or coastal, the brand you guys mentioned said 12 miles (though why that is magic I dunno, outside is outside). If you are going way out, you'd want something that could handle those swells and chop.
Personnally, I'd buddy boat if I were prospecting where there aren't other people. You can spread out, VHF with 8 foot should get you at least 10 miles, so two boats can cover some ground.