Just to get the USB2 controversy out of the way. I installed an additional sata hard drive into this PC and moved the blockchain to that drive.

Bitcoin core has been fully synced and correctly pathed, shows current block height.

Deleted armory databse, changed the path to datadir as well and started armory again.
Since 6 hours now like before as well "Organizing blockchain" without any progress beeing shown just a green shade transitioning from left to right and spinner spinning.

"goatpig" or some other dev of this software, please have a look again in this thread. thx.