there was a thread on here awhile back on the PST boxes , some were not adjusted properly and needed readjustment . i think the problem was they were adjusted way to tight .
With a 16:1 box? Shouldn't be that bad. The steering effort below +5° of caster is significantly better than what it is at +6.5°. But it's all relative, I've heard guys with similar set ups as that complain about the manual steering. Meanwhile compared to my set up that would be a piece of cake.