The wheels are 14" standard dish, but spaced out about 1.5" each side.
The steering geometry is correct.
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Three things here.
Standard 14" wheels? What are these then? What ET? What width? Minis never had 14s so you will have to help.
Why 1.5" spacers? Lose them they will not be helping one little bit.
You say it is correct. For what? See wheel info above. And then there is your suspension. What is it? Standard Mini rubbers? Stiffer rubbers? Rose jointed?
Lowered? Raised?
Tyres treaded? Slicks?
What hubs?
Sounds like set up issues to me.