The reason that Armory is complaining that Core is running is because you still have it setup to auto manage the bitcoind. Just go to the settings and uncheck the setting that has Armory run Bitcoind in the background. Then try again.
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(ERROR) SDM.py:791 - ValueError in bkgd req top blk
Traceback (most recent call last):
File "/usr/lib/armory/SDM.py", line 765, in __backgroundRequestTopBlock
numblks = self.proxy.getinfo()['blocks']
File "/usr/lib/armory/bitcoinrpc_jsonrpc/authproxy.py", line 105, in __call__
resp = json.loads(resp, parse_float=decimal.Decimal)
File "/usr/lib/python2.7/json/__init__.py", line 352, in loads
return cls(encoding=encoding, **kw).decode(s)
File "/usr/lib/python2.7/json/decoder.py", line 364, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded