Looking at the BJCP guidelines, they seem to be a little.. er.. yeah. I think what I think of as an English IPA (i.e. stuff I drank in the UK called IPA), they think of as a session or normal bitter. Yes, the guidelines say 40-60 IBU; you may as well run with your original plan if you're going by BJCP styles. You'll get what I mean when you try the Deuchars IPA I brought back.
If you're doing stovetop the 2oz will probably get you about 45IBUs, which should be fine.
25 days should be fine with S-04, assuming force-carbing. I would agitate the carboy a bunch after primary has finished, to aid in cleanup.
Dave: I always found hot-break and boiling point to be pretty much simultaneous. Do you find otherwise?