Have read (here on HW) that if your PSA goes up two consecutive times after radiation you have a BCR. Is that right?
No that's not right. There is as much misinformation here on HW as anywhere else on the net. I know I have had several misconceptions changed by more informed members.
The definition of BCR after RT is the "Phoenix definition" which was adopted in 2005. PSA has to go up 2 points above the nadir value. So in your case, 2.06 would be a biochemical recurrence.
Your rises in PSA are most likely the result of the ADT getting out of your system. Bounces are common after RT, and are associated with a good prognosis. It can take several years for PSA to bottom out after radiation.