Old Smokey
ICAO Doc 8168 states that, when proceeding to the final segment of an approach procedure from a parallel entry, aircraft shall intercept the inbound track of the hold and not return direct to the facility. I'm not sure whether this would be achieved at 280kts (don't know because I've never tried it).
Touch'n'oops
Why didn't you ask the captain to slow to max holding speed prior to entering the hold? This might have prevented the subsequent problems.
Airclues