Are you sure you need to go on triplet now? The general knowledge at PSA < 0.1, 99% of the cancer cell is gone. Some even venture to say that 99% plus, ie 99.99% is either dead or dormant. It is questionable if adding chemo would do anything. If your PSA is still falling, your doctor would likely to keep you on hormo until it reaches the 'nadir'. That is when it is stable at some level below 0.1. Then he/she may recommend reduction on hormo, either dosage or eliminate altogether.
Dont mind me. I am just another layman trying to make some sense of the whole thing.