Correct that's why Hustler came out with a modification kit to fix the discharge problems. I did it to mine and it is a big improvement!
Here is the kit;
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Here is how I cut the cut the deck opening bigger;
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Here is the kit installed on my SD54;
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Kit part # 123352
Attached is the factory bulletin #603 explaining how to do the mod.
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Here is the kit;

Here is how I cut the cut the deck opening bigger;

Here is the kit installed on my SD54;

Kit part # 123352
Attached is the factory bulletin #603 explaining how to do the mod.
.
.
.