Wow, nice Fiesta you have in there.
I've worked on a white '14 Fiesta not so long ago, you can see it here:
http://www.autogeekonline.net/forum/show-n-shine/78351-2014-0km-white-ford-fiesta-coating-but.html
In no way it's finish compares to yours, your car looks gorgeous.
The thread is not exactly a show and shine, car had a dealership / someone else repair at whole driver's side extending to rear bumper which would made a full correction attempt expensive for the owner (with me, at least, I charge high to undergo a risk like this), he just gave up correcting the mess this time and we followed by coating after slightly 'minimizing the damage' a bit for this time.
So I've used PBL cleansing polish and then coated, topping with Souveran after coating cure as agreed with customer at the start. End results makes him very happy and he already came back for maintenance wash, which means he truly liked the outcome and the way I've dealt with situation.
If I had truly worked on this car (being asked and paid for correcting imperfections), I would give you a better idea of how the paint answered, but being the owner not interested I just let it alone after fine polishing, and called my autogeek friends to help me dealing with the non-100%-accomplished feeling that was hurting me...
Also, working on a repaired area would not give me the exact feel as well.
Sure, it was a huge lesson, including trying to meet customers expectations even when we couldn't meet ours.
One thing I suggest for you is to order a Swirl finder light so you can inspect your finish better.
Have seeing your picture (without seeing any defect from this angle), I'd suggest you to start even lower than suggested earlier, maybe also in a polishing pad, but try a finishing polish at first. Try a finishing pad if you can, at least the first test spot.
I say this because it may be overkilling for you to use a more cutting polish like PF2500 and letting your finishing needing a re-finishing step to 'pop' again... that said, if you can solve up things with a finishing polish you'll be not just getting rid of defects, but also improving the finish to the last drop of shine you can extract from it.
Menzerna SF4000 has a cut of 4/10, and 10/10 for shine, so it's a fair cut for new finishes like yours, while offering the maximum shine possible (what we beg for!).
Also, Don't forget to clay it.
To always work clean and forwards (not backwards), do a gentle claying step (yet effective), takes a bit more time in claying, but then you gain time when polishing not having to deal with huge clay marring mess. Claying is as essential as polishing and applying LSP. Every step will add you a bit more that will represent together a tad more at the end.
Again, those above are just suggestions for helping you to form an opinion on what you may do.
Hope that helps,
Kind Regards.