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(not a pro so could be totally wrong here but)
To me the mid-temp looks prettier.
But it should be slowed down for more penetration.
Also have an initial fill layer of the gap (fast and hot/back and forth to fill).
That's what I would instinctively do with my 110V Lincoln 135 gas at least. Could be totally wrong.
Without the gas to blow the crap away and shield the cooling, the slag from flux-core just builds up and causes complications. Techniques may be different.
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