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I have designed mixed smelting facility that is tileable, and can safely smelt steel and stone bricks without getting stuck.
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The idea is to use stack inserters with overriden stack size. Each inserter is connected to its own chest (green wire) and is disabled unless there are enough items in a chest for one full stack. Iron plate inserter have stack size 10, stone inserter - stack size 12, and iron/copper ore inserters default sizes, as there is no need to limit them.
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To control smelting all inserters are connected with red wire to a small control unit.
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It takes 1 on ore signal on input and emits -10m signals on all other channels.
Upper there is some messy thing that decides what to smelt based on logistic network contens. Constant combinator on the top is input for desired quantities of each product. It can pobably be made cleaner.
This simple setup can jam, as inserter will take less then 1 stack if there are not enough items in the chest.
With one inserter you have to both enable/disable it and set filters, which is not possible without combinators.
Your setup is not optimal anyway. In case of steel, there is a possibility to get 2 or 4 steels only. In that case, there is no benefit from productiviy modules. You pay for the energy but the purple bar just diminish after switch to another smelting process. I highly recomend you to "open" any change of insert condition after each 10 finished products. 5 is not enough becouse 25 steel plates on input is not multiple of 10.
And why so huge combinator jungle? You can simpy place 4 decider combinators like:
1. copper plate <= everything : copper ore set to 1
2. iron plate <= everything : iron ore set to 1
3. steel <= everything : iron plate set to 1
4. brick <= everything : stone set to 1
where combintors input is your stats of cooper plates, iron plates, steel and bricks. You can send output to one filter inserter and set "set filters". You can also simply fake -10M of any product to combinators input, if you want to ban anything for case you have lower raw resources than 10 in the input chest.
You can also have only two chests (one input, one output) and place one extra filter inserter for iron plates between them (with condition that target chest has less than 100 iron plates). It helps to your logistic network significantly.