After studying the feasts of YHVH for many years I certainly believe as you do that the natzal (catching away) of the believers will happen on a Rosh Hashanah, although not necessarily this year.
 
This is the feast called Yom Teruah in the scriptures which means "day of blowing" or "day of the awakening blast".   It is a day when we are to be awake and be watchful.  It is called many things including "the last trump" (shofar) and "the day no man knows".
 
A whole book has been written on this feast by Joseph Good from Hatikva Ministries in Texas.  It is called "Rosh Hashanah and the Messianic Kingdom to Come".
 
Edward Chumney also believes the catching away will take place on a RoshHashanah and has written an excellent book called "The Seven Festivals of the Messiah".
 
I'm sure you have also studied much about RoshHashanah so I won't write any more but I just wanted you to know that I agree with you on this.
 
Shalom,  Roberta
 
P.S. Please pray for Joseph Good, his family and the people who work with him in the ministry as they are in Nederland, Texas, in the Port Arthur area which was hurt badly by Hurricane Rita.  I just heard tonight that in Nederland they have no power, no water and no sewage services.  There is much flooding and damage in that area which took a direct hit from the storm.