I doubt that it's because levels were hot. I'd bet it's either a HP filter on the 744 or just the response of the 150's combined with the response of the PA and room. Like the others, I hear a the significant roll-off down low with the 150's, which I think partly accounts for some of the general clear/crisp personality. If no HP filter, given that the bass was present at the recording location through the 461s, then the bass is probably there in the 150 recording, only significantly lower in level than you'd like. In that case you can probably bring it back into better balance successfully with a low-frequency shelf-eq tuned to the appropriate corner frequency, Q and gain.
^^
That's quite similar the DPA 4098 hypers I'm using, which I'd loosely categorize as somewhat similar to the 150 sound. Low end is rolled off pretty strongly at any significant distance and that can either sound nicely balanced or rather bass-weak depending on the situation. In situations where it sounds bass-weak, the bass is still there and can be brought back up to where it sounds balanced with eq. Not to the same extent as the solid bottom octave from an omni, which I'm usually running along with them, but more or less in line with the low end from a typical cardioid.