Jim 25lb test mono is pretty heavy line overall for the beach but its not necessarily what is restricting your casting distance. I am no expert but most rods have a sweet spot or weight that loads just right resulting in good distance.
Personally for line I like to fish 17lb test off the beach when there is no chance of hangups or obstructions. You could try one of the newer type lines like Whiplash to maybe get a little more distance.
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