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What are the chances of getting a D.Ct. clerkship from lower T14, top 15%, secondary journal?

I and people I know had similar/better stats. You've got a decent shot but I wouldn't say it's great. The more places you are open to clerking the better your chances will be. Also if you're willing to apply for multiple cycles your odds will go up as well.

Thank you for the input! Anything else I can do to increase my chances?

I have an internship at a D.Ct. and I have heard of people doing a second internshi (at a Cir. court) to icnrease chances of getting a clerkship. Is it worth it? Would other work experience be more relevant?

At, e.g., Cornell, the non-law review status has been more or less killer, especially with grades outside the very top echelons.