Yes, looking at the psa figures, the rate of increase is certainly rising and into the marginal zone.
All the best to both of you, you're in a difficult place right now. I realize it's only 3 months since he had a PSMA PET scan but his psa has gone up from .4 to .7 so maybe Marsden as others have suggested, might think there's a chance of a PSMA PET scan showing up something now.
This might be above their scope, but the specialist nurses here might be able to offer some options.
Jules