Steering effort for manual 16:1 - should it be this high?

Thanks all around for the feedback, guys! It makes sense that this would be the net result of the components I have. I knew it would be heavy but I guess I underestimated.
While I was hoping someone would have some idea about something I might have missed, hearing that this is normal is the next best thing.

inertia said

The more + Caster, the more effort required .
You are actually lifting one side of the car .
I have seldom gone as far as +5, most customers are very happy with +2, - 3 max. These cars came with 0 to neg 1 from factory with bias tires.
Reduce your caster, there will be significant difference .

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This is absolutely worth considering. I don't know that I can even exploit the benefits from the extra caster with the steering as it is...