These Quicksilver V4’s should fit the bill!
I would have to second the notion of Quicksilver in your beautiful system, I replaced a pair of VTL mono120s with a pair of new M120 Quicksiver amps as a stop gap till my VTLs which I have owned for 20 years got back from repair. Sold the VTLs and never looked back. The Quicksikvers have the K150 upgrades. Have to say that the V4s are a better looking amp if those things are important to you, you might want to call Mike Sanders and discuss which would be best suited to your application. Enjoy the music.
If the Wilson speakers he owns now (upgraded or not) are typical of most Wilsons of yore then some pretty healthy impedance dips are to be expected. For OTLs, low impedance loads are not a desirable pairing. Having said that, Atma MA-2s were specifically mentioned and it's possible they just might have the balls to cope with 3-4 ohms scattered here and about, That's a mess o' 6AS7s your sportin' there, pawpaw. Anyway, Ralph would know should he care to chime in. I think it'd be borderline unless he springs for MA-3s and we're talkin' lotto money now.
I can’t imagine anything close to or above their price significantly bettering Quicksilver, I certainly haven't heard it. Superb value and top shelf performance, it has to be in the transformer design. As to which model would be better in your specific application, check with Mike Sanders. The M120s have a lower output impedance than the V4s but less power.