To be honest, I don't know if there's going to be a ton of benefit to a "racing" shoe for IM distance, unless you're going to be running sub-3:20 off the bike. Otherwise I think you'll be more comfortable running in your Adrenalines.
Now, that being said, here's what I would look at (shoes at the top are lighter weight, shoes at the bottom a little more substantial):
Saucony Fastwitch - light midfoot posting, 4 mm drop. My old racing shoe (as a former Adrenaline guy).
Brooks Asteria - the replacement for the ST Racer. Haven't worn it, but looks very interesting.
Brooks PureCadence - the stability shoe of the Pure Project line up, 4 mm drop, softer/more forgiving.
Mizuno Wave Catalyst - the replacement for the old Elixir. I wish that they still made the v1 Sayonara...but that's just me.
Saucony Guide - comparable to your Adrenalines, just a little lighter. Shouldn't tell much a difference in the offset between this and the Adrenaline.
Couple shoes that I find I can run in everyday that don't feature posting, but because of their design feel excellent:
Saucony Freedom ISO
New Balance 1080v6
Hoka Conquest/Bondi
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