Uneven tie rods and adjusters? Steering wheel alignment weirdness

There should be a small "on center" spot
^^^^ Yes. This is called high point on steering boxes. Manual boxes you can feel it,it feels tighter at high point.
You didn't say if it was manual or power. Power is a bit harder to "Feel" but it is there.
Best is to disconnect linkage at the box pitman arm to get your box centered. At that you can adjust your tie rods for straight ahead.Adjusting them equal lengths, reconnect the pitman arm then make your final toe setting.
The aftermarket steering wheel adapter (Grant) does not have a master spline like a factory wheel.
You will have to adjust the wheel till it is driving straight. 1 or 2 splines makes a big difference.
I just had mine off to find a horn problem and I had to move mine on the splines to get it right a few times.