Here is the issue: Silk and Eagle X are in a league of their own. Regardless if your level. Enduro is good but more technical to pump/connect. SK8 is fine…until you try the Silk. AFS uhm mast is superior that the F-One v.1 14 uhm.
So really depends how much surf vs dw you are going to do.
You could also invest in a Cedrus mast and pick and choose between AFS and F-One
For me these days its Silk + Cedrus Evo and v.2 Eagle (not X) + 12mm mast.
What happened to the 80 UHM you originally mentioned? That’s the best choice.
The used HM is the way to go out of those two. The HR has a 135mm chord and would not be the correct mast to pair with the high performance foils you are getting with this kit.
how much do you weigh? I have a normal 14mm mast from F-one, at 200+lbs i really didnt notice flex often when I think back on my wipeouts. I ended up getting a 16mm titan2 anyway