Also 35 here and just had a thread with similar question, linked below. I think what I ran into in the middle of SSB 2 MV was that a little under fueling or under-eating here and there can compound over time. So just because you are getting through one week or even 2 at a given level, what remains to be see is whether you will make it through the whole block.
I had to dial up the eating big time and dial down the training for the last 2 weeks of the blocks. I wont make that mistake again, because completing some of the workouts was WAY harder than it needed to be and I may not have made as many gains. Next ramp test will tell.