System Plateau - Ideas?


The last time I plateau’d was
Rega RP6 (Ortofon Black) > Musical Surroundings Nova II > Line Magnetic 518ia > DeVore O/93 

2 changes, more recently:
1. Switched amplification to
DeHavilland Ultraverve III (Dueland Special) > FirstWatt Aleph J
2. Also replaced Ortofon Black with a Hana ML.

Overall very nice, but I feel I’m missing a bit of “edge”.
One direction I’ve been leaning is single driver (researching Omega). Another direction would be rethinking amplification. Has anyone plateau’d here? What did you try?

Of course, everything sounds perfectly fine as is :)

Cheers,
John
dotchaos
The question is serious, what is your reference?

you have and have had some great gear :-)
Anything you can do to remove EMI/RFI: Acoustic Revive RTP2-6 pwerconditioning and power cables, REM-8 grungebuster, if possible, a separate power spur from your junction box and Bybee speaker bullets. Protecting power supply and cables from interference is often overlooked but incredibly rewarding. Start with shorting plugs on all inputs, doesn‘t cost much.
If you seriously are rethinking your amp: Wavac EC300b, a match made in heaven with high efficiency speakers. 
@tomic601 curious what you mean by reference. As in, system? Or, what am I listening for/what is important?