I'd do several more oil changes, you've replaced less than half of the old oil, and plenty of us use ATF FS without any problems whatsoever, it's a very good oil IMO.
How clean were you when doing the filter and pan?
The tiniest bit of crap can create problems in the valve body.
There's a reason autos are assembled in a dust free assembly room.
Did you use a solvent to clean the pan? (most leave residue, white spirit is a good one to use as it dries cleanly)



				
				
				
					
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) are DexIIIH fluids, which doesn't really mean anything anymore as it's a superseded specification, ie. you can't submit a fluid to GM to be tested and licensed, we're relying on the oil blender's integrity that it meets the old spec.
				
			
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