Yeah the 4061s don't run hot enough without some help. Even a SP batt box results in low levels, like -15db or more depending how loud the source is, when plugged into a JB3. I've clipped the 4061s with the R1, so an external pre is not necessary, but folks have said the mma6000 by DPA has an impact greater than volume alone.
As for the mics being warm? No way. Every time I've used them they've been true and accurate to the sound source. They're just...natural. Sometimes this has not been a positive characteristic!