Bud blast question

[Keysguy]

I have a couple things going on I am curious to get your collective wisdom on.

#1 is bud blast on this specimen Epicyc. Serena O'Neill.
Yes, it's gorgeous (and smells amazing too) but it could have had two-three times as many flowers. For reasons I can't figure out, when the buds are about 1/2 developed (so some would have opened) it starts blasting buds. I'm guessing it's one of 2 things; either there is a nutritional deficiency of some sort or it's a genetics thing where it produces more buds than it needs to ensure there are ample blooms to ensure reproduction. It does this every year and I have very few plants that blast on me and never 2 years in a row let alone as many as I've had this plant.

Thoughts?

I'll post #2 separately.