Yes, a small handfull. GH's dry hop additions of "a few cones" do make a difference with some of his brews, adding a subtle twist to the brew. However, in this case I don't think they'll make much of a difference, Styrians are quite powerful so I wouldn't think you wouldn't notice any Goldings used in addition as a dry hop.
Looking at your recipe, it's pretty much Wye Valley HPA, except they use a very pale malt. Target is quite harsh as a bittering hop but balances nicely with the Styrians, I make this regularly.
Old thread here on trying to clone HPA Wye Valley Hereford Pale Ale (HPA) Clone Recipe
Thanks! That's very helpful!