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A few things to try, make a change, test and repeat until you get the result your after.

Turn the voltage down

Turn the wire feed up

Push the puddle (dont be afraid of having the gun on a 30 degree or more angle on thin stuff)

Run more stickout, more stick out on MIG lowers the amps, and thus the heat input

All else fails, adjust your welding sequence, backstep it, do a whip and pause instead of moving strait across the joint to spread the heat input, and keep practising
 
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