Hyperion HPS-938 speakers

First, I have no experience with these speakers. However, I've learned to always look to the amplifier/speaker match as one of the keys to a satisfying or unsatisfying system. Amplifier-speaker synergy is paramount. If the match is a poor one (a mis-match), and synergy does not exist, you never hear the best the amplifier can offer, nor the true potential of the speakers. It sounds like you have a mismatch and lack of synergy there. If my theory has merit, you need to look to speakers that are known to match well with Arcam gear, since you have an all Arcam system. In addition, I may be wrong, but don't some of the Nordost cables have a lean sonic signature? Good luck in uncovering your system issues.

What amp do you use?
They are nice speakers from what I heard at the recent hi-end show. Although I should a agree with you that they had a bright character wilson-like.

I have an Arcam P1000. Using it in a 5.1 system. The spare two channels are being used to bi-amp the fronts. Looking at the McIntosh MC-207 and the NAD M25 amps to replace it. Now wondering if I should keep the amp and change the speakers. I have tons of detail and a wide and deep soundstage, just no "meat on the bone" so to speak.