I've done four 5 gal batches to date. All were good, but the only one I dry hopped was noticeably less sour on the palate. I don't have a way to test PH.
My pots and Anvil bucket get this.. Scotch-Brite Heavy Duty Scour Pad (6-Count)-226-CC - The Home Depot with hot water
And if that doesn't cut it they get this.. Scotch-Brite Stainless Steel Scrubbing Pad (3-Pack)-214C-CC - The Home Depot.
I guess I'm lucky in this regard.. I live on a lake with noisy AF Canada geese. Depending on how many are around, 10-12 lbs of grain will be gone within the hour.
I'd go with 1oz Cen @ 60min -- 0.5oz of Col @ 30min -- 1oz Cas @ 0min. Dry hop with the Citra, Ama, & Gal. 57 IBU
9lbs Pale
1lb Mun
0.5 Cry 40
0.5 Cara
Assuming a 5 gal batch.