It should probably depend on your goals for the year. In the past I’ve found week 2 the hardest of the build program - I guess that’s my body adjusting to the new intensity. I’m at the end of my current SSB MVII this week and I expect that in two weeks I may be in the same boat as you - large FTP jumps from taking 9 months off.
My current thinking is if I can’t hold on I’ll re-plan - which most likely means going back to SSMVII again at the increased FTP.