Tomthiel,
My experience is exactly as you say; Thiels need high current power. My 2.4’s woke up when I hooked up an fpb 300 Krell. I had 2.2’s for years, then 2.3’s and finally 2.4’s. I am convinced that I under powered them all, even with the PM 2000 EAD, which was not a high current amp. I used Krell 250 monos with CS6’s which worked well,
I think I just talked myself out of a pair of 3.5’s, as I realized I need to get a high current amp, despite the good price for the 3.5’s.