I believe you may need to center your axle first with the lowers again, then set castor with upper. If that isn’t enough castor, then pull in your lowers some. Or +\- some with the upper, to keep your axle centered as best as you can.
To achieve even more, need to adjust +\- the upper equally to keep axle centered still by either lengthening or shortening the lowers.
Make sure lowers are even on both sides also. Hope this helps and didn’t add to more confusion [emoji106]
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