elderflower help

[lee1]

hi all ive been tinkering with an old recipie i wrote down but never brewed not sure how much elderflower to add heres my recipie .

23l batch
marris otter =3.500 g
wheat malt = 250 g
crystal malt = 120 g
styrian [pellet]=30 g @60m
styrian [pellet]=25 g @30m
dried elderflower = 20g @ 15m
styrian [pellet]=20g @ 10m
efficiency 80 percent
ibu 29.2
colour [srm] 8.5
abv 4.22
does this look ok any help or tips will be most welcome [thanks lee ]