who to max ascend

Tough choice. Even though I already had maxed saber lily, Mordred, and Siggy, I absolutely love saber alter I just got for AoE saber needs. The extra high atk stats really show.

Shuten is great at spamming debuffs, though not as much damage on np. During Christmas farming I got more damage from scathach assassin than Shuten on the same quest. So if you have scathach, Shuten might could wait.

I would pick enkidu on my team since I suck at summoning gold lancers and grailed Cu is my best st lancer. (I also have 50 grail eligible servants and a war chest of hearts). Though from the write up sounds like enkidu is a bit hard to use since his kit doesn't focus on anything in particular

Ps, condolences on medals farming, but sooo worth it. My saberlot is now 90/10/10/10 np2 and I might grail more...

You could slap Enkidu at the end of any team and kind of make him work, he is best as someone whom solos, and he certainly appreciate stats a lot because of his already mediocre damage stat and high HP stay. Saber Alter is a good AOE saber, enough said. However, you said you have Lancelot saber, he is easily the best of the 4 you mentioned, being a monster without any team support taken into consideration, so grind Camelot out somehow

idk if any are 'worth' grailing, but for reference, i also commented something about this in a previous comment, but i grailed my baber alter to 100, and she hits harder with her np as a aoe than some of my st servants. plus she is my fav servant so it's a win-win. if you have a fav servant out there, i'd save your grails for them, but if you want to grail for gameplay, that's fine too.

as for the hearts, i'd say give them to baber alter so you could have a baber alter so that you have a saber a 80, but then again, i also have saberlot at 70, and he does a damn good job even at 70. since you're at the end of camelot, and going to babylon next, douji is also a good call if you don't have any other assassins cuz of all the riders you'll see. babylon also has lancers, but since you have baber alter and saberlot, you'll be fine for the most part.

Grail who you love. Most times lvl80-90 is enough.

As for ascension, I'd say saber alter if you need damagers, Oni if you want debuffer.

And once you can Papa Lancelot is great.