Thank you for all your replies! I assumed that I was fueling properly regarding carbs, but seeing some of the numbers quoted in this forum (5-10 g/kg on high-intensity workout days) I am not so sure anymore…
Regarding the accuracy of the FTP from the ramp test - especially the 325 w all time best one - looking back I realise that did manage to do 322 w / 319 w (NP / average power) on a 40 min outside all-out effort five days earlier, so while not a full hour, maybe that FTP was not too far off. Will be interesting to see if a similar/more extensive VO2max block will have the same great effect further down the track.
I will up my carb intake and lower my FTP or workout intensity a bit and get through the last week of Build before getting a recovery week and hopefully not see too big drop in my next test.
Thanks again and happy riding!
Cheers,
Kasper