Speaker suggestions under 4k

Since you liked the Tekton why not just get another pair?

If you don't like cabinet noise, why not get rid of the cabinets? Plenty of options in your price range.

Subject to caveat emptor and all of that, if I were in the market actively at this point, I already would have jumped on the Pioneer S-1EX’s on offer through eBay (and perhaps elsewhere).  TAD drivers and beryllium tweeter, high-line Andrew Jones design. I have the smaller and presumably lesser S-4EXs (no beryllium, monitors) mounted atop a pair of JBL PS1400s and will never sell them.   Shipping is the only thing I would have any concerns about.

 I have seen a range of B&W 803s at or below your price point that also would draw my attention, along with a smattering of Harbeths and Spendors.   It is a rather seemingly obscure model, but for a good price — $720.00 — offset by a potentially longish drive, I might check out the Spendor S9s available in Minnesota or Wisconsin (as I recall) Then, I would grab the Spendor center channel offered on eBay or one of the audio sites listed at a starting bid of $499.00.   
If your ceiling (amplitude?) goes up a bit, the Joseph Pulsars listed somewhere for $6,000.00 (perhaps put in a sensible offer) look beautiful.  The Pioneers would be my first pursuit, all things considered, but there are a lot of amazing speakers out there right now in your pricing realm.  

I’d dump the Crown amp and get a good home audio amp after I selected my loudspeakers. Your amp is a weak spot and better loudspeakers will just make it worse.