I see a couple things in your update that concern me:
1 - Yes, you should've started to slowly balance the pH and increase the FC once the stains were lifted. By waiting, especially with warmer water, you increase the potential for algae. At that point all bets are off - it's back to the drawing board.

2. The pool store has done you no favors. I hope you realize that now. But above you are showing test results that are not from what TFP would consider a reliable test kit. Those numbers could be way off, so no matter what you do it's not going to work. Accurate water testing is absolutely critical.
In the end, how the iron reacts depends on 3 basic factors: 1) - The amount of iron in the water; 2) - The chlorine level; 3) - The pH level.
With proper testing, you have control of 2 of those items. For the iron content, all you can do is try to filter out as much as you can with polyfill. The more you filter out to lower the iron content, the easier your water is to manage. Once the filtering has been exhausted, then you a sequestrant to keep the iron in a soluble state.
See this experience below.
We filled our pool from our well. We knew the risks and knew we would have a battle when the water was 12" deep as it looked green from the metals. Our fears were confirmed when we added chlorine and the water turned brown almost immediately. Enter 5 gallon polyfil filter. It worked...
www.troublefreepool.com