Only vaguely stated in your post, but it looks like your current HSU sub is physically too large and you want a smaller one, but you’re concerned the Paradigm has too much power?
It’s a simple matter of physics that in order for a sub with a smaller enclosure to perform on par with one in a larger enclosure, more excursion from the cone is needed as is more amplifier power. So there’s no reason to be concerned about the Paradigm’s scary power rating.
In any event, just because a sub has a gazillion watts that doesn’t mean you are required to utilize them all. It’s always better to have more performance potential than you need than to not have enough and the sub bottoms out all the time and makes rude noises.
Regards,
Wayne A. Pflughaupt