Something like this, will brew it tomorrow

Will probably not do a full volume biab even though I have the equipment for it. Got very high alkalinity in my water somewhere between 250-300 mg/l... Have boiled and decanted some of it but not sure how effective...
BeerSmith 2 Recipe Printout -
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Recipe: Johnny Dove's APA
Brewer: JD
Asst Brewer:
Style: American Pale Ale
TYPE: All Grain
Taste: (30,0)
Recipe Specifications
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Boil Size: 36,16 l
Post Boil Volume: 30,16 l
Batch Size (fermenter): 27,00 l
Bottling Volume: 24,00 l
Estimated OG: 1,054 SG
Estimated Color: 15,2 EBC
Estimated IBU: 52,0 IBUs
Brewhouse Efficiency: 72,00 %
Est Mash Efficiency: 77,3 %
Boil Time: 90 Minutes
Ingredients:
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Amt Name Type # %/IBU
2,00 kg Pale Ale (2-row) (6,0 EBC) Grain 2 30,0 %
2,00 kg Munich (20,0 EBC) Grain 1 30,0 %
0,33 kg Caramel/Crystal Malt - 20L (39,4 EBC) Grain 5 4,9 %
2,00 kg Pilsner (4,5 EBC) Grain 3 30,0 %
15,00 g Chinook [13,00 %] - Boil 60,0 min Hop 7 18,0 IBUs
10,00 g Centennial [10,00 %] - Boil 20,0 min Hop 9 5,6 IBUs
15,00 g Centennial [10,00 %] - Boil 5,0 min Hop 12 2,8 IBUs
15,00 g Centennial [10,00 %] - Boil 10,0 min Hop 10 5,0 IBUs
12,00 g Chinook [13,00 %] - Boil 30,0 min Hop 8 11,1 IBUs
10,00 g Cascade [5,50 %] - First Wort 90,0 min Hop 6 6,0 IBUs
10,00 g Cascade [5,50 %] - Boil 1,0 min Hop 14 0,2 IBUs
10,00 g Centennial [10,00 %] - Boil 1,0 min Hop 15 0,4 IBUs
10,00 g Cascade [5,50 %] - Boil 10,0 min Hop 11 1,8 IBUs
10,00 g Cascade [5,50 %] - Boil 5,0 min Hop 13 1,0 IBUs
1,0 pkg SafAle English Ale (DCL/Fermentis #S-04) Yeast 16 -
0,34 kg Wheat Malt, Pale (Weyermann) (3,9 EBC) Grain 4 5,1 %
Mash Schedule: BIAB, Medium Body
Total Grain Weight: 6,67 kg
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Name Description Step Temperat Step Time
Saccharification Add 40,24 l of water at 70,0 C 66,7 C 75 min
Mash Out Heat to 75,6 C over 7 min 75,6 C 10 min
Sparge: Remove grains, and prepare to boil wort
Notes:
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Perhaps some of the Centennial for the 60 minute addition as well?