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If the limit is already sufficient for your spend level on the card/your income, there's no real advantage to constantly requesting a CLI. The concern about spooking other lenders has some validity to it (limits vs income), although it's unclear how frequently it ends up mattering for people. That said, in general we have been seeing lenders tightening up, so inflated limits may not be the best thing to go for right now.
I agree with the above post. If I were you I'd likely just roll with whatever limit you currently have and consider bumping it up once your income level goes up. With your income level currently, I would think whatever your Discover limit is now is perfectly acceptable to handle your spend.