Thanks for the update!
It sounds like the tank has settled down nicely, sometimes that takes longer than our patience allows. The staghorn algae should also die off once everything is completely run-in and balanced. Its presents is an indicator that the tank isn't quite fully there/balanced/settled yet! Have the shrimps moved away from the heater now?
I also have a few ember tetras with my red cherry shrimp, it adds another dimension to the tank, though they probably pick off a few of the shrimplets if/when they can! Shrimps are a lot more delicate than fish.
You shouldn't need the C02 or flourish excel, especially with the fish as well, but I understand if it is now going well you may not want to change anything. You may find these actually cause your plants to grow too quickly and result in you having to spend more time on maintenance/trimming etc.
All being well, the shrimp (neocaridina) should readily breed and you should soon be restocked!