Thanks to both of you for responding. I'm really agreeing with both of you.
I think a more powerful amp will help drive the SF's better with more control and detail, but to do that probably means going the tube mono-block and pre-amp route. Right now the Willsenton is probably the weakest main component.
I do think the using amps output and amplification in the REL sub via the high level input was the way I was thinking of going, and dialing in so its barely detectable.
I can try the REL for 60-days through a local dealer so I'll probably start there but start saving for a new amplification approach.
Thanks again, George