I’m not exactly sure what you mean by "delay". Do you mean the lag time between telling the coll object to read a data file and the time it is "available"? Couple things to try:
1. put a "deferlow" after the trigger between the bang and the dump. This should ensure that the dump message gets to the coll after the file has been read, or
2. rather than having the trigger send the dump message to coll, use the bang coming out of the 3rd outlet of coll (bang on read) to go to dump.