More important than the jacket, is how you layer underneath it. Even the most breathable waterproof jacket can't handle the amount moisture you create from sweating when running.

To keep yourself dry, you need a thin wicking layer next to your skin, and a layer on top of that (usually some layer of fleece of appropriate thickness based on the temperature). That will suck the moisture away from your body. Then, even if the jacket is not breathable enough to remove all the moisture (I haven't found one that is up to the task on a hard run), your body will stay dry.

I'm not sure which Brooks jacket you had, but I have the Wanganui jacket from Brooks and I have run in degrees approaching 0F and been warm. The outside is wind-resistant but also has areas where venting is important, like under the arms and on the back. It is lightweight which is important to me, I hate feeling overdressed.  I layer under it as mentioned here with a thinner "core" piece and then if needed, a fleece vest (fleece only when getting into single digits, that is warm stuff). Otherwise, another layer over the core piece.  You mentioned a T-shirt in your post, definately NOT cotton...cotton is rotten!

Definately 30F is relatively warm so I am not surprised you're overheated in that jacket you bought.  I have worn even my jacket in the 30s and been too warm, but I run very hot.  You might want to try the Wanganui on www.brooksrunning.com They also make mittens and tights in the same material known by the same name.  Good luck!

Krissie