My suggestion: Relax!! Trace ketones are not a cause for concern, especially when accompanying a blood sugar of 176. Fifteen minutes is not very long for a correction to take effect; corrections can take an hour or two, more if you ate recently. I would just wait a bit and see how it goes. If after 2 hours you still haven't come down. Are you confident in your ISF? I have been on a pump for a year and just realized I need different ISF's for morning (which wasn't enough to bring me down) and evening (which was crashing me too low). If you're not certain of your ISF, keep records of corrections and consider revising it if you see a pattern.
Most of us don't bother checking for ketones unless we are 250 or higher without coming down for a period of time. DKA at 176 is not something to worry about.