Huge jumps congrats! You are putting in the work. I had a similar reax when my LTHR dropped.
I did HM on 4/23 and FF today.
4/23 HM FTP + 27 (235) MAP +38 (291)
LTHR dropped 4 from 171 to 167
I rationalized this is change as a function of my HR Floor lowering. Recently my fitness gains + rest has seen my overnight resting HR has dropped as my fitness has improved, it gets into the low/mid 40s.
As you progress with those new FTP settings, be aware … they could be just a little high. I tried to hold during that HM 235 FTP for 20 mins in today’s FF and I just couldn’t get it done (only 223, but still a nice jump up from 3/28’s 208). I look at HM as something to turn to when a few hard workouts in a row seem too easy. Knock out a HM if the FTP jump is big then yes. Do a FF a few days later to get the complete picture ahead of a new training plan. - Cheers to even more success for you!