Can you bloom a phrag besseae to death?

[WillisWill]

I have a single fan besseae (bleeding heart x colossal). It appears very healthy, and is on its fourth bloom from spike. It seems to me that the flowers are getting progressively smaller with each new bloom. Is this normal, or the sign of the plant suffering a little? I'd much rather cut off the spike now in order to ensure vigorous growth in the long term, but don't know if it would make it a difference.

Thanks

Will

edited as I can't spell