Your iron is no worse than mine and I have clear water. My setup is also very similar to yours. You are missing a critical component though, you need to insert a 100 gallon retention tank between the Air-Max/Chlorine feed and you filox filter. You are doing the right things by injecting air and chlorine, BUT it takes 20 minutes of contact time between the chlorine/injected air and the water before the dissolved iron turns to a solid. The filox filter cannot remove dissolved iron, it just passes right through the filter. You need the 100 gallon tank to give you that 20 minutes of contact time. When you install the retention tank add a valve so you can manually drain the bottom 10 gallons of the tank every week. The worst of the iron will settle to the bottom and by removing it before it gets to the filters helps.
A few other things:
-Your filox filter should be set to backwash EVERY DAY. If it has not been set to regenerate every day the filox media is likely ruined and will need to be replaced. I have mine set to backwash for 10 minutes and rinse for 2 minutes every day. Long rinse times will just add iron back into the tank you just backwashed so I do the minimum. It has been running with these settings for 4 years now with no media changes.
-I would also remove the cartridge filter and move it to the end of your filtering process (if you use it at all). The filter reduces the flow rate to the filox filter during backwash and filox needs 9gpm. You should manually backwash your filox filter and use a 5 gallon bucket to measure the output from the filter. It needs to be 9gpm. If you end up replacing the media consider buying a vortex tank to replace you current tank. Vortex tanks supposedly help to fluff up heavy media more evenly during backwash to help prevent channeling in the media.
-Also consider adding a 1.5 cu ft backwashing centaur carbon filter after the filox filter. The carbon will remove any residual chlorine and will remove the smell from the water. The carbon filter can also remove small amounts of iron that get past the filox filter. I have both a carbon a a filox filter.
- I'm not sure if you have IRB or not. I had the same oily sheen you are taking about and it went away when I got the filters working properly. My well has always tested negative for IRB. But, if you do have it the chlorine should kill it as long as you are injecting enough.
10ppm iron is a pain but filox is probably the best media choice to filter it out (IMO) and it will filter it successfully once you setup is correct.