I'm not a fan of the Ortleiobs either, not keen on the mounting straps. I ended up with Wolfman bags on my 690 fitted to TT racks as the Wolfman racks were expensive and lacked strength IMHO. I did however copy the bag mounting design of the Wolfman racks and added it to the TT racks plus a mount for a Tooltube. The main benefit is that you can safely carry just the one bag if needed, it's independant of the other bag although there are substantial over the straps iof you're using both bags.
The Wolfman's clip in to the stainless steel loops welded to the outside of the pannier frame:
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