Citra/Simcoe APA - Dry Hopping advice please!

Had my first shot at all grain yesterday.
Went well and hit 73% efficiency, OG of 1050 with 18 litres into the fermenter. I seriously need a ball valve in my kettle though, as I ended up pouring most of the trub into the fermenter.. grr..
Used the following recipe, which was originally for an all Citra APA but I decided to split all late hop additions to a Citra/Simcoe blend.

I'd welcome some advice on dry hops (and the recipe in general). At the moment I'm thinking 20gm Citra + 30gm Riwaka for 7days. Would this work? I have Simcoe, Citra, and Riwaka available for dryhopping so am open to alternatives for my dry hopping ratio.

Batch Size: 5.28 gal
Boil Size: 7.66 gal
Color: 4.1 SRM Equipment: Pot and Cooler (18 Gal/70 L) - All Grain
Bitterness: 51.7 IBUs Boil Time: 60 min
Est OG: 1.049 (1.050 Measured) Mash Profile: Temperature Mash, 1 Step, Light Body
Est FG: 1.009 SG (-)

Grain:
4 Kg Malteurop Pale Ale Malt (2.8 SRM) - 85%
500 gms Malteurop Pilsen (1.9 SRM) - 11%
200 grm CARAPILS (2.3 SRM) - 4%

Hops:
15gm (.5oz) Nelson Sauvin [12.0%] - 60 min
10gm (.35oz) Citra [13.9%] - 15 min
10gm (.35oz) Simcoe [13%] - 15 min
12.5gm (.45oz) Citra [13.9%] - 10 min
12.5gm (.45oz) Simcoe [13%] - 10 min
12.5gm (.45oz) Citra [13.9%] - 5 min
12.5gm (.45oz) Simcoe [13%] - 5 min
15gm (.5oz) Citra [13.9%] - 0 min
15gm (.5oz) Simcoe [13%] - 0 min

Dry Hops (7 days):
20gm (.7oz) Citra + 30gm (1oz) Riwaka??

Yeast:
US05 - 1 packet

I'd really appreciate some advice on this one
Thanks.

I'd stick with citra and simcoe. 1.5 oz each at least.

Falconers Flight is my favorite for dry-hopping. I did an all Citre DH once but didn't find it all that good in terms of aroma. Simcoe works well though as I'm sure Riwaka would too.

Thanks for the help guys. Unfortunately Falconers Flight is a bit hard to track down in New Zealand...

Definitely agree about Citra and dry hopping... I've brewed an all Citra before and although nice, was a bit one dimensional for me.
How does 1.5oz each of Simcoe & Riwaka sound? Should give plenty of Citrus/Grapefruit/Passionfruit aroma.

I would think a simcoe/ riwaka combo would compliment each other nicely.