There's more to drifting JoyCons than first meets the eye...Nintendo changed the motherboard on the left Joy-Con at some point and so swapping out the analogue stick doesn't always cure the issue....
You can see on the RED joy-con below the motherboard extends up to the right of the analogue stick, a black foam pad isolates the board from the ribbon connecting the buttons.
On the BLUE joy-con the board does not extend and there are no foam pads.
Just replacing the analogue module on the BLUE joy-con can still give drift, even with a quality OEM stick replacement. You need to insert a foam pad below and above the analogue stick ribbon to protect it. I can only assume drift greatly affects the short motherboard more than the extended one.
You can see on the RED joy-con below the motherboard extends up to the right of the analogue stick, a black foam pad isolates the board from the ribbon connecting the buttons.
On the BLUE joy-con the board does not extend and there are no foam pads.
Just replacing the analogue module on the BLUE joy-con can still give drift, even with a quality OEM stick replacement. You need to insert a foam pad below and above the analogue stick ribbon to protect it. I can only assume drift greatly affects the short motherboard more than the extended one.
