No longer grail virgin

Grailed my first servant last night Chloe, followed by altria rider.
Reason, chloe good servant, 1st 4 star archer servant, it was a wellfare but still got her last minute, skills impressive. Altria, first 4 star rider as well, it's altria, santa theme, aoe np lvl 5, buster chain, didn't really use my 3 star riders back when i first got her.
Have 11 grails left. Due to questions I asked and the feedback it appears grailing 4/3 stars are best. Aside from waifus and favorites.
Also id 536,602,739
names N'Klaus in game. If you'd like.