Felt Da? If you buy a bayo 3 fork version you can get even more reach with the long stem option. The bayo 4 version only comes with a 90mm stem where the 3 has an option for a 110. I'm running 500ish (don't recall off the top of my head) pad reach on a 51 frame with the longer stem.

Grabbed my notebook:
Pad reach: 487BOP/535MOP
Pad Stack: 598

So, it looks like a 51cm Felt DA with a boynet 4 and 90mm 0º rise stem would hit your numbers easy. Lots of seatpost in that bad boy too.

ETA : my fit numbers

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