a couple of guys in my bike club have had to sell Planet X bikes on after finding them uncomfortable over long distances.
‘Sportive’ frames are style over substance, you could achieve the same position by fliping the stem, but this appears to be against some unwritten roadie rule.
If it was my money* I’d just get a 2nd hand CAAD cannondale off ebay, I bought mine 7 years ago (it was 2 years old then), and since upgraded with a dura ace groupset, shimano wheels, carbon bars, and carbon cranks. It’s still only cost me about £600 alltogether! They’ve got a reputation for being very comfortable but stiff well made frames at the expense of not baing as headline grabingly lightweight as some complete bikes.
*I actualy did rather than it being hypothetical.