Have owned ESTitanium for 6months and find have to pull handbrake lever to 10 clicks on a steep hill to hold. Also haven't managed to operate hill start brake hold. Otherwise very happy with the car in general
Have found on a step hill that the handbrake dose need to be pulled up quite high. Not sure ours is actually fitted with hill start assist as on the Fiesta its activated from the option on the software menu on the display and it doesn't come up on the ES.
Just read in the owners manual that it works automatically if you hold the car on a hill with the foot brake when you release the pedal the brake system detectes it's on a hill and holds for 2-3 seconds.
Will have to give it a try.