I can go down to 8ms RTL.
I had already done that test with previous firmware and the result is the same for me. No degradation.
My test setup:
CQ12t, mic input1, USB to PC, into VST Host (Kushview Element).
Inside VST Host the input1 is routed to Input6 of the CQ set to digital input.
I then record input1 and input6 in the CQ12T.
Last operation is to compare the 2 audio files: 8ms latency.
I am in 96khz, 32 samples.
Not sure if and how much the VST host is adding delay, but because it is a straight in/out form PC I assume that this should be minimum delay.
RTL depend mostly from the PC configuration, and the DAW.
But I am far away to be an expert.