Welcome to the 2nd half of "the game" known as maintenance and thanks for "decloaking"!
If it makes you feel any better, my tri-g's were 330-ish when i started and last time i had full fasting blood testing done, they were somewhere in the 80s!
So I would think those would come down significantly. At least I hope they do!
For me that was where I noticed the most significant change in my blood work.
For me the challenges of P3 were much more mental than physical. It's really all the same effort and work without the positive feedback loop of seeing scale numbers continue to move downward. (although a lot of people still lose in P3 a bit as their body's settle out to their own healthy weight range which may be different than your own initial perception of your goal weight.) A lot of people seem to do some "goal transference" to more physically based goals to take on a new set of challenges but that's entirely up to you of course!
And thanks for posting the weight loss data by week! 20 lbs in 17 weeks works out to just under 1.2 lbs per week on average during your active weight loss phase. Most people who are successful really seem to fall somewhere in that low "1 dot something" range over the entire process. I'm always fascinated by those who set time targets based on an average of 2+ lbs per week as I'm not sure I've ever seen that play out for anyone over any lengthy period of time or any significant amount of weight to lose. And as you astutely noted, we need to go through both the fast and slow periods over time and simply go through the process and learn from each along the way.
FWIW, I think you'll probably do fine with maintenance. You have a health and wellness motivation going for you and it seems like you have a good attitude and understanding of what this whole thing is really all about. Keep us posted on the blood work results and as always continue to enjoy the adventure and journey!
What kind of side benefits, or things you didn't expect, have you also experienced in a positive way that has changed for you? I'm always curious about that aspect of it as well. Best wishes and congrats on achieving something you set out to do for yourself!! There is a lot of personal power in that achievement! Continue to draw on it in the future when you need to!!