Adding the P3x cockpit extends the potential reach even further compared to whats on the cervelo website.
For comparison, these are my numbers (im 178cm but all legs and no torso... but they still compare enough)
785 saddle at 40 setback
665 stack
515 reach to middle of pads
P3x setup in the fwd position and 10deg angle
~70mm height on the monopost rider
another 20mm hole step available to go fwds on the pads (so could get to your 535)
All on a 56 frame. So i agree with the above, I think a 56 would be suitable, even more so with the cockpit change. Good luck!
For comparison, these are my numbers (im 178cm but all legs and no torso... but they still compare enough)
785 saddle at 40 setback
665 stack
515 reach to middle of pads
P3x setup in the fwd position and 10deg angle
~70mm height on the monopost rider
another 20mm hole step available to go fwds on the pads (so could get to your 535)
All on a 56 frame. So i agree with the above, I think a 56 would be suitable, even more so with the cockpit change. Good luck!