Salvation Army Pool eye irritation

You meet or exceed the 7 gallons per bather-hour APSP-11 rule. So 700 gallons out of 100,000 gallons is 0.7% per day. You basically dilute your water by about 19% every month. While this certainly helps, it's not going to be enough to keep the chloramines in check by itself or with chlorine alone.

IF the eye irritation is from nitrogen trichloride that is higher due to your higher active chlorine level (2 ppm FC with no CYA earlier; now 0.8 ppm FC with no CYA), then using a small amount of CYA would lower the active chlorine even more where 2 ppm FC with 10 ppm CYA or 4 ppm FC with 20 ppm CYA would be roughly equivalent to 0.2 ppm FC with no CYA. Though this should lower the irritating nitrogen trichloride, it may increase over time the measured CC level though it will now mostly be chlorourea and monochloramine which are not as irritating. The problem is that your county/state pool codes may require you to have 0.2 ppm CC or less and don't care what the "type" of CC actually is. They may also forbid you from having any CYA at all. In that case, supplemental oxidation will be your only answer (unless you can get people to improve their habits to reduce organic load as Ben suggested) in the long run.