The at09 and 33 work brilliantly in the audiomods arms: I know because I used the same combination.
My preference was for the 09 but they are very close indeed.
Main system: Sony TTS8000; AT1010; Audio Technica Art1; The Lentek; Cambridge 851n, Yamaha NS1000.
System 2 - SBT; Technics SH-X1000 DAC; Denon PMA-850