The fact that you perceived Bimby to be "Louder" tells me that the volume was not probably 100% matched, and I'd wager if you had the equipment to properly get a perfect volume match between the two dac's and A/B them, the perceived differences would all but vanish. I'd wager the bimby would be more resilient to bad power sources, and give less problems when hooking up to a laptop, or bad power, just based on it's beefy power supply, your less likely to experience any issues there - however if you've got a nice computer system, or an enthusiast class motherboard, many of witch specifically state "Clean USB Power" as a selling feature, your much less likely to notice a difference, also WYRD helps with the power issues if you've already got a JOT/DAC and are noticing strange things with a laptop. I wouldn't spend money on a decrapifier though, unless you've identified a specific need.
Your not the first one who's bought both units at the same time with no bias, and returned the separate dac. It's mostly people that already owned a Multi-Bit Dac that are saying OMG it's so much better, yadda yadda yadda, you will see in time many of these people will go back and forth between the dac's, and one day they will want new headphones, or speakers, or computer parts, or cash for another hobby, that dac will be the first thing to go
I do have a technical question, the Schiit boy's have stated that D/S dac's are 3-5 bits of resolution, does that mean balanced Jotunheim is 6-10 bits because of it's balanced design? I don't get to hung up on bits, as there's a point of diminishing returns/no returns, maybe around 14 bit, maybe less. That's why you can't tell a difference between 16/44 and 24/96, or 32/192
Edit** many 24/96 recordings are execeptionally good, because they were designed to be "hi fi" 24/96, close attention was paid to the recording/mixing. This has nothing to do with 24/96 or 16/44 and everything to do with the recording. Some recording's are just really well done, i've heard good recording's on 128 KB MP3's that sound better then FLAC's that are highly compressed and schiit recordings.
Furthermore, people need to learn how to EQ. If Jotunheim's not a good match to the HD800 or "Bright phones" just EQ that **** down a bit. We've got really really good parametric EQ's that are available for free, and very powerful/transparent. If your source is a PC, whats the big deal? I get it if your using something else as a source, but on PC there's no excuse.