Bromine Chemistry Question

[FormerBromineUser]

Made it through the week! I hope you had a great holiday weekend celebrating our veterans and being with family. I went to Virginia to pick up my son from college and on our way home we visited several historical sites including the Flight 93 Memorial. 41 heroes died that day in PA; 40 adults and one yet-to-be-born person. Anyway....

Currently my numbers are:
FC: 2.0 (it was tested while I was gone and varied from 1.5 to 2.5 only)
CC: <0.5
pH: 7.4
TA: 100
CH: 60 (did this twice so I am sure, hmmmm)
CYA: did not test. My best guess is 20-25. I only added 2-1/2C dichlor all week so I am saving reagents.
STAINING: Most of the week I had an orange mottling on the steps but just slightly darker than right after the ascorbic acid scrub. However, yesterday, in 75 degree water temps, the boys dove in! When their waves hit the steps, I could clearly see an orange water line on the stairs as the waves fell below it (white above, solid light-orange below). This staining is not visible otherwise. I just installed the 1.5 ppm Spring Opener CuLator packs tonight in both skimmers; I only received them today and there were only two in my order????

What do you suggest I do next?

BTW, I have on hand:
25+ lbs. granular dichlor (99% Sam's Club)
11 lbs. cal-hypo (68% In-The-Swim)
3 G 12.5% bleach
8 121oz. 8.25% bleach
5 lbs. sodium carbonate
2 lbs. sodium bicarbonate
76 oz. (1 box) borax
2 G 31.45% muriatic acid
4 qts. polyquat (Kem-Tek 60% algaecide)
1 qt. 60% HEDP (Jack's Magic Pink Stuff)
25 LaMotte borate test-strips
DE 20+ lbs.
2 skimmer socks