Bass issues with Energy RC-50- more power?

First time I am reaching out to the Audiogon community for expertise- what a great resource, thanks for any help you may lend.

I recently purchased some Energy RC-50 speakers, paired with an RC-LCR center and (not yet connected) RC-10's for the rear. I have an older but great shape Marantz SR7000 100WPC x 5.1 receiver and a Hsu Research VTF-1 sub.

When i ran the RC-10's as front channels with the sub, sound overall was great- but the small speaker size impacted the mid and low frequencies. I thought an upgrade to RC-50's would add a lot more to mid- and low-levels, but thus far, impression of bass response is that it is very lacking in the RC-50's. Reviews talk about the deep bass in these speakers- so I presume/ hope that this is not a speaker issue. Perhaps a power issue? Do I need more power to run these properly? 8 ohm speakers all around, receiver is rated at 8 ohms. Thanks for your suggestions on what I can/ should do to achieve best possible sound with this setup.