I rarely record SBD, maybe that's the difference. But I normally record at about 65. I withdraw my comment since I can't really speak to SBD recording very well. Almost all mics for me, with the CA-9100
IMHO, one shouldn't be recording SBD with just a single -HR or M10 anyway, as a straight SBD is in 90% of situations useless and the lazy man's way out. I see too many jokers at shows who are some idiot that knows nothing about taping and thinks "plugging into the board" makes a "sick recording" for their stupid internet video. It annoys sound engineers who have to accommodate people with no gear, and it annoys people who actually give a damn about the quality of their recordings (i.e., people on this board).
[/end rant] But anyway, I'd suspect an -HR or M10 is fine as long as your SBD patch cables have an attenuator, which I'd think you'd need with either. FWIW I don't see a reason to upgrade the -HR to the M10 either; I like the M10 slightly better overall, but I only bought it b/c I broke my -HR.