Step 5 of the Ga.Medic tutorial will get you to the 12/17/2007 kitchen, which was the last WM6 before the first releasable 6.1 came out in early March 2008. You have to have an appreciation for the work and testing involved in developing these kitchens. That's why there are like 100 pages associated with them with issues from testers (basically us) that can be fixed in the next kitchen. It looks like your ROM was made with one of the first WM6 kitchens that came out. I got my 6700 in Nov 07, found the PPCGeeks site in Dec 07, read for about a month, and did my first (and only) flash in Feb 08. However, prior to the August 07 kitchen, I don't know how many iterations exist. I know that when I asked the forum, they did not recommend flashing to the already cooked ROMs that were floating around and cook through the kitchen. Just folllow the directions and you should be OK. Have you checked your Bootloader version yet? The 1.02 and 1.04 versions will be less troublesome than the 2.XX versions.
Well, I guess I didn't pick up on the fact that you could never get your BT headset to activate your phone for a call with the Cyberon or the voice tags. I know that my BT headset works with MSVC with the Helmi_c WM6 ROM I cooked so that does seem to be ROM related.
I'm not quite sure what that 3.5 AKU means, either. I do know that that was the last VZW-sanctioned upgrade to the ROM, and that was still WM5. When you do Start>Settings>System tab>About on the device what does it say about the operating system version? Maybe you aren't really running WM6??? Mine says Windows Mobile 6 Professional.
If you do happen to run into issues, it is best to post to the end of that Ga.Medic thread, which is still active. There is gguruusa there that really knows their kitchen stuff. I didn't have any problems other than not having .NET 2.0 Framework installed (kitchen wouldn't start) and RUU couldn't update the phone cuz it couldn't find an ActiveSync file.
You do know there is a separate upgrade subforum:
http://forum.ppcgeeks.com/forumdisplay.php?f=53
We should be posting there according to the rules but so far no one has complained. I suppose you could do a search over there for WM6 kitchens after 12/17/2007 if you want to make sure there are no more kitchen versions. Also, I think it would be best to work off one tutorial. Mixing the files between different builds could really be a disaster.