check it out, maybe 30m times were faster, even w/ vest, b/c my buddy was over a lane and a half w/ his weight ves, outside of the timers (not getting timed), but racing me. When you race each other, it's always faster. try getting a 30m laser on yourself when adrenaline rushes over you. you'll dip I bet.
but still u should be able to run 6.4-6.6 at the very least in the 55m, bc once again u will be racing vs someone.