Feedback on Imperial Pils recipe

I had a bottle of DFH My Antonia last week and am a HUGE fan! I’m starting to realize I really enjoy pilsner’s, especially imperial’s. I want to brew one like DFH’s and found some info online about the hops and grain. The ABV is 7.5%. They use 100% pils malt and a mix of warrior, simcoe and czech saaz hops. I have magnum on hand and no warrior so I made that substitution, but I’m curious about the hop schedule. I believe DFH mixed the 3 hops together and added small amounts every few minutes during the boil making it a continually hopped imperial pils. So here’s what I came up with. I decided to go with additions every 10minutes. May stretch that out to every 5minutes if someone can give me a good reason why to go that far with it. Interested in feedback.

malt & fermentables
% LB OZ Malt or Fermentable ppg °L
100% 13 0 Canada Malting Superior Pilsen 35 2 ~
Batch size: 4.5 gallons

Original Gravity
1.075 / 18.2° Plato
(1.067 to 1.079)
Final Gravity
1.021 / 5.3° Plato
(1.018 to 1.023)
Color
5° SRM / 10° EBC
(Yellow to Gold)
Mash Efficiency
75%

hops
use time oz variety form aa
boil 60 mins 0.25 Czech Saaz pellet 3.2
boil 60 mins 0.125 Magnum pellet 14.0
boil 60 mins 0.125 Simcoe pellet 13.0
boil 50 mins 0.25 Czech Saaz pellet 3.2
boil 50 mins 0.125 Magnum pellet 14.0
boil 50 mins 0.125 Simcoe pellet 13.0
boil 40 mins 0.25 Czech Saaz pellet 3.2
boil 40 mins 0.125 Magnum pellet 14.0
boil 40 mins 0.125 Simcoe pellet 13.0
boil 30 mins 0.25 Czech Saaz pellet 3.2
boil 30 mins 0.125 Magnum pellet 14.0
boil 30 mins 0.125 Simcoe pellet 13.0
boil 20 mins 0.25 Czech Saaz pellet 3.2
boil 20 mins 0.125 Magnum pellet 14.0
boil 20 mins 0.125 Simcoe pellet 13.0
boil 10 mins 0.25 Czech Saaz pellet 3.2
boil 10 mins 0.125 Magnum pellet 14.0
boil 10 mins 0.125 Simcoe pellet 13.0
boil 1 min 0.25 Czech Saaz pellet 3.2
boil 1 min 0.125 Magnum pellet 14.0
boil 1 min 0.125 Simcoe pellet 13.0
dry hop 7 days 1.0 Czech Saaz pellet 5.0
dry hop 7 days 0.5 Magnum pellet 14.0
dry hop 7 days 0.5 Simcoe pellet 13.0
Boil: 5.0 avg gallons for 90 minutes

Bitterness
69.4 IBU / 8 HBU
ƒ: Tinseth
BU:GU
0.92

yeast
Wyeast Czech Pils (2278)
lager yeast in liquid form with medium to high flocculation and 72% attenuation

Alcohol
7.2% ABV / 6% ABW
Calories
248 per 12 oz.

P.S. I know that hop schedule seems crazy, but my thought would be to add up the total amount of hops. Grind and mix them all together and then measure out 1/2oz for each addition.