Amp/Pre -amp for Martin Logan Requests

I have a pair of original Quests which I drive with a Krell KSA 250 class A amp. On paper in seems like a good match as the amp is stable to 1 ohm or less as stated in the amps manual and I think quest go down to 1.2 ohm somewhere in their frequency range. I feel this combo is musical but have not tried any other amp.

I am using Sequel II (not ReQuest) and drive them with Perraux 5150B+ Sonic Frontier SFL2 with no problem and also use Sonic Frontier Power 3 (220Watts) with some problem with music - sound heavy.

I have the ReQuest's predecessor, the QuestZ. I've had good luck with ARC SP-11 preamp and at various times used the following amps with great results: Hafler 9500 w/musical concepts mods. Perreaux 3150 Classe' M-1000 monoblocks (these were/are the best match) M-L recommends 200w/ch max but they've got to be kidding. Requests want big power and current to sound their best

I'm using a Balanced Audio Tech VK500 Bi-wired. Drives the Request with no problem. Have listened to their VK30 and VK50 tube pre-amp's, will be purchasing one.

I'm using an ARC SP14 pre with two Classe DR8 amps. Synergy....