rear caliper with best clearance?

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Hi all,

First time poster here.

I found a sweet Paul Taylor True Temper S3 frame and just finished swapping all my parts from my BMC onto it (Campy SR 11, Zipp 404, Enve 1.0 fork etc). I installed the calipers last, only to find that the top of the 25c Conti 4000 tire contacts the underside of the caliper. Additionally, the brake blocks are as high as they can go in the caliper arms and I still need a bit more room to get the pads to properly seat on the aluminum brake wall. The rear is a single pivot SR Skeleton style caliper. There is about 8mm of clearance at least to the brake bridge and more than ample clearance to the seat tube and between the chainstays. it just seems the brake bridge low enough to put the caliper out of its useable range. Zero issues with front, as you'd imagine.

I've also tested Vittoria Corsa 25c tires and Campy Daytona dual pivot rear (pre-skeleton) and still too tight.

Are there other caliper options with known better clearance?

Thanks!