You can take the chlorine to 15 ppm -- it definitely won't hurt anything.

I'd also recommend leaving the cover at least partially open. After that kind of bather load on a small pool, there's a lot of gook in the water than has to be oxidized. Some of the oxidation products are noxious, but are volatile and will escape the pool on their on. However, if the pool's covered they remain trapped.

Just as important: some types of 'goo removal' require BOTH chlorine AND UV (ie, sunlight) so covering the pool interferes. If you're not going to be using the pool for a few days, I'd turn the heater off and uncover the pool.

If it's practical, it would also help to clean the filter, since it's better to remove the goo physically than chemically.

However, I wouldn't be surprised if it took most of the week to return to the water quality you've seen in low use periods.